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TABLE OF CONTENTS
INSTALLATION PREPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . 2
PARTS SUPPLIED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
INSTALLATION OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . 2
ALTERNATIVE TRANSDUCERS AND MOUNTING METHODS . 4
TRANSDUCER EXCHANGE . . . . . . . . . . . . . . . . . . . . . . . . 5
USING THE 350TX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
HOW SONAR WORKS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
SIMULATOR OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . 7
WHAT YOU SEE ON SCREEN . . . . . . . . . . . . . . . . . . . . . . . 8
CONTROL FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . 11
MENU FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
ADVANCED FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
USING THE DIAGNOSTIC FEATURE . . . . . . . . . . . . . . . . . . 25
USING ALTERNATIVE TRANSDUCERS . . . . . . . . . . . . . . . . 26
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
CUSTOMER SUPPORT . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Rev. 11016E
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INSTALLATION PREPARATION
PARTS SUPPLIED
PARTS SUPPLIED
Before installing your 350TX, please ensure the following parts are included
in the box:
• 350TX fishfinder
• Transducer with 6m (20') of cable and mounting hardware kit
• Mounting system and mounting hardware kit
• 2m (6') power cable
• Publications kit
If any of these items is missing, contact your local Humminbird dealer.
ACCESSORIES
Humminbird offers a wide assortment of accessories that complement and
expand the capability of your new 350TX. These accessories are designed
with the same high standards and are backed by the same one-year
warranty. The Humminbird Accessory catalog included with your unit
contains descriptions of the many accessories available and ordering
information. All Humminbird accessories are available through your full-
service Humminbird dealer.
INSTALLATION OVERVIEW
The 350TX consists of two primary components to install: the control head
and the transducer.
The control head contains the sonar transmit and receive circuitry, as well
as the user controls and display. It should be installed in a location that
provides access to the controls and visibility while in use. The control head
mounts on a quick disconnect mounting system that swivels and tilts
providing flexibility for viewing from almost anywhere on the boat.
The transducer converts electrical energy from the transmitter into
mechanical pulses or sound waves. The transducer also receives the
reflected sound waves and converts them back into electrical signals for
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INSTALLATION PREPARATION
INSTALLATION OVERVIEW
display on the control head. It should be installed in contact with the
surface of the water in an area that has smooth water flow - usually on the
transom of the boat. There are several mounting options for the
transducer. Review the following section to determine the method that
works for you and your boat.
Determining How to Mount the Transducer
The 350TX includes a model XT-6-TB-90
transducer. This transducer can be
mounted on the transom of the boat, or
bonded to the inside of a fiberglass hull
boat.
The transom installation, which is the
most widely used, places the transducer
on the outside of the boat hull. This
technique produces the least signal loss,
and provides a way to adjust the
transducer after installation. The
mounting hardware included is designed
to protect both the boat and the
transducer should the boat strike debris
Transom Mounted Transducer
in the water or when trailering.
As an alternative to transom mounting, it is
possible on many fiberglass-hulled
boats to glue the transducer on the
inside of the boat hull. Since
fiberglass has similar sonar character-
istics as water, the sonar signal can
pass through the boat hull with
minimal loss. The hull of the boat
must be single layer construction
(not double-hulled). Also, any air
trapped in the lamination of the
fiberglass would prevent the sonar
signal from passing through.
Inside the Hull Mounted Transducer
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INSTALLATION PREPARATION
ALTERNATE TRANSDUCERS AND MOUNTING METHODS
Inside the hull installations require no holes be drilled into the boat and
through experimentation, high-speed operation comparable to transom
mounting can be achieved. Two part, slow cure epoxy is required to glue
the transducer in place.
ALTERNATE TRANSDUCERS AND MOUNTING METHODS
The 350TX comes with everything necessary for installation and operation
on most boats. However, there are several situations which may require a
different type of transducer. Inboard boats, wood or metal hulls, and sail
boats create unique transducer mounting needs. Alternate transducers and
mounting methods are detailed below.
Portable Mounting
The standard transducer can be adapted for
portable installations using part number MHX-
PT2. This accessory adapts your transducer to a
suction cup mount for temporary installation on
the boat hull or other surface.
Trolling Motor Mounting
The standard transducer can also be adapted to
mount on most trolling motors using part number
AD-STM-7. This accessory includes a bracket and
hose clamp that allows mounting the transducer
to the body of most trolling motors.
Thru-Hull Mounting
Thru-hull transducers install through a hole
drilled in the hull of the boat. Larger boats or
boats with inboard motors create turbulence
that make transom mounting ineffective. Also,
hulls that are very thick or are double layered, or
made from materials such as wood or metal,
(which do not conduct sonar signals) make
inside the hull mounting inadvisable.
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INSTALLATION PREPARATION
TRANSDUCER EXCHANGE
Thru-hull mounting may require the use of a fairing block to level the
transducer with the waterline. Also, since special tools and knowledge may
be required to perform this type of installation it is best to refer to a
qualified marine technician.
TRANSDUCER EXCHANGE
Other transducers are available as replacements for the standard
transducer. You may exchange your new and unassembled transducer for
another type. Contact your local distributor for details. Some transducers
may have additional costs. Refer to the Accessory catalog or call your
distributor for information.
BEGINNING INSTALLATION
Now that you have determined the transducer mounting method, you can
begin installation of the 350TX. The fold out installation guide included
provides detailed step by step instructions for installation of the control head
and transducer. For transom mount transducer installations using the
XT-6-TB-90, you will need the mounting template at the rear of this manual.
In addition to the parts included you need the following for installation and
operation:
• A powered hand drill and various drill bits
• Phillips and flat-head screw drivers
• A ruler or measuring tape
• Pen or pencil
• 12 volt power source (your boat’s battery)
• A 1-amp fuse
• A fuse holder (if you are wiring directly to the boat’s battery)
• Silicone sealant (for sealing drilled holes)
• 2-part, slow-cure epoxy (for inside the hull transducer installations)
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USING THE 350TX
HOW SONAR WORKS
HOW SONAR WORKS
Your Humminbird unit uses sonar to
locate and define underwater objects,
define the bottom terrain, as well as
determine distance.
Sonar technology is based on sound
waves. Your Humminbird unit sends
out a sound wave signal. With this
signal it determines distance by
measuring the time between the
transmission of the sound wave and
when the sound wave is reflected off
an object. Your Humminbird uses the
reflected signal to interpret location,
size and composition of an object.
Sonar is very fast. A sound wave can travel from the surface to a depth of
70m (240') and back again in less than ¹⁄₄ of a second. It is unlikely that
your boat can "outrun" this sonar signal.
The 350TX is a dual frequency, tri-beam unit, and generates three distinct
sonar signals - one narrow, two wide. Each signal is optimized for a
particular purpose. First, the center beam transmits at a frequency of
200 kHz in a 20° (narrow) symmetrical pattern for greater depth capability
and excellent detail. Information from this center beam is used to draw the
graphic representation of the bottom on the display.
The left and right beams are generated at 455 kHz for increased sonar
resolution and are shaped in an elliptical pattern for greater area of
coverage. (45º side to side, and 16º front to back.) Information from these
two beams in conjunction with the center beam is used to accurately
detect the presence and location of fish.
The combination of the three beams and dual frequencies, provides the best
possible combination of a large area of coverage and a high level of detail.
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USING THE 350TX
SIMULATOR OPERATION
Actual depth capability depends on factors such as bottom hardness, water
conditions, and transducer installation. Units will typically read to deeper
depths in fresh water than in salt water.
SIMULATOR OPERATION
The 350TX contains a simulator that allows
you to use the unit as if you are on the water.
The simulator is invaluable for learning how
to operate the 350TX.
There are two ways to start the simulator. If
the unit is powered off, press and hold the
POWER button for approximately three
seconds until you hear a continuous chirp.
The simulator can also be started by selecting the Simulator option on the
start-up screen after you power-up the unit. When this screen is shown,
simply press the DOWN ARROW until “Simulator” is highlighted. When the
screen times out, the unit will be in simulator mode.
When in simulator operation, the 350TX responds to control inputs as if it
is in actual operation, so feel free to experiment, or to customize the unit
for your particular operation.
To exit Simulator mode, power the unit off.
When in simulator mode, the word “simulator” occasionally
scrolls across the display indicating the information on-screen is
not real sonar data.
FEATURE MEMORY
If your 350TX is installed with a transducer connected, any changes you
make to the set-up or User Options (see Control Functions) while in
Simulator are retained in the unit’s memory. This allows you to use
simulator to experiment with the various set-up options, and retain your
selected settings for normal operation.
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USING THE 350TX
WHAT YOU SEE ON-SCREEN
If you are using the 350TX in Simulator when no transducer is connected,
any selected options are lost when the unit is powered off. The 350TX will
return to Factory Settings, or options selected when last used with a
transducer, if no transducer is connected.
IMPORTANT: A transducer must be connected to the 350TX in
order to retain user settings selected when in simulator mode. If
no transducer is detected, the unit defaults to pre-selected
options when powered off.
Figure A
What You See On-Screen
Your 350TX uses a 128 V x 64 H
matrix FSTN LCD display. This display
provides outstanding viewability in all
light conditions over a wide range of
temperatures.
At initial power-up, the 350TX uses
settings that were set at the factory.
After initial use, the 350TX will
remember the settings you enter.
There are several elements on-screen
that are common to all modes of
operation.
Temperature/Speed. The initial screen layout takes one of two basic
forms depending on whether the optional Temp/Speed accessory is
installed. Figure A shows the default view when the Temp/Speed accessory
is installed. Figure B shows the default view when the Temp/Speed
accessory is not installed.
Depth. The digital depth number shows the water depth directly beneath
the transducer location.
Depth Range. The depth range is shown to the right of the screen. The
upper number is 0 indicating the surface of the water. The lower number
is one of the nine depth ranges available that best match the depth of the
water. As the depth of the water changes, the range changes as necessary
in order to retain a bottom representation on-screen.
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USING THE 350TX
WHAT YOU SEE ON-SCREEN
Bottom Depiction
Zero Line
When in Auto mode, the horizontal
line at the top of the screen is the
“zero line,” representing the surface
of the water. Occasionally there is a
gap in this line. This gap indicates
the unit is updating the display even
if the bottom is not visible on-
screen, or if the bottom information
is not changing.
New sonar information appears on
the right side of the graphic area of
the display and moves to the left as
new information is displayed. The
350TX automatically selects the
appropriate depth range to show the
depth of water beneath the
transducer. This range is selected so
Water Depth
Depth Range
Figure B
the bottom representation is typically shown about ²⁄₃ down the
display.
Bottom. The graphic depiction of the bottom provides an effective tool for
understanding the composition of
Surface Clutter
Rocky Bottom
the bottom. If the bottom is hard and
smooth, the bottom depiction is
narrow and dense. If the bottom is
soft mud or sand, the depiction will
be thick and less dense. This indicates
much of the signal is absorbed by the
soft bottom. If the bottom is rocky or
rugged in composition, the depiction
is of varying density and textured in
appearance.
Wave action also affects the bottom
depiction. The information drawn is a
distance measurement, so if the boat
is moving up and down over flat
bottom, the bottom depiction often
appears in regular variations that
match wave timing.
Soft Bottom
Hard Bottom
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USING THE 350TX
WHAT YOU SEE ON SCREEN
Structure. Structure is defined as any object physically attached to the
bottom. The sonar configuration of the 350TX is optimized to give the most
accurate depiction of bottom structure possible. Grass, trees, stumps,
wrecks or other debris are accurately displayed, however the depiction of
these objects varies with boat speed and direction. The best way to learn to
interpret structure is to operate the 350TX over a variety of known
conditions and experiment with user functions to best represent those
conditions on-screen.
Surface Clutter. Surface clutter is the layer of water near the surface that
is rich in algae and other growth, and often is aerated by wind or wave
action. This area of water interferes with sonar transmission and often
appears on-screen as regular clusters of individual dots near the “0” line.
Thermoclines. Thermoclines are sharp differences in water temperature.
These are easily identified by the continuous nature of the return.
Second Returns. When a sonar signal is reflected off the bottom back to
the transducer, there is often enough
energy left in the signal to be reflected
off the surface of the water back to the
Thermocline Second Return
bottom a second time. Second returns
appear as a slightly weaker bottom
representation exactly twice the depth
of the primary bottom return. The
second return is most likely to occur in
shallow water and in areas of relatively
hard bottom.
Fish ID. The 350TX uses advanced
signal processing to further evaluate
any sonar return between the surface
and the bottom. For instance, a small
school of bait fish usually appears as a
dense cluster of individual dots. If the
return meets certain additional criteria,
a fish symbol will be assigned. There are three different size fish symbols
used to indicate the intensity of the sonar return. While signal intensity is a
good indicator of relative fish size, different species of fish have different
sonar characteristics, so it is not always possible to distinguish fish size
between varying species. The signal intensity is "normalized" for depth so
10
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USING THE 350TX
CONTROL FUNCTIONS
Fish in Left Beam
Fish in Right Beam
that a small fish close to the boat does
not appear as a large fish symbol.
+
ID
adds an additional piece of
information to help the user locate fish.
On selected fish symbols, the digital
depth of the designated fish is drawn to
help locate the fish vertically. This is
especially helpful in setting bait depths
or for downrigger operation.
The specific fish symbol indicates the
type of sonar beam the fish is detected
in. This gives you a reliable indicator of
side to side location relative to boat
movement. Fish symbols which are
hollow are detected in the outside two
beams. Hollow fish symbols facing to the
right are in the right beam and therefore
ID+ Fish Depth
Fish in Center Beam
are to the right side of the boat (as viewed from the driver seat facing
forward). Hollow fish symbols facing to the left are detected in the left
beam, and thus the fish is to the left side of the boat. Solid fish symbols
represent fish in the single center beam, and these fish are directly under the
boat.
CONTROL FUNCTIONS
The 350TX uses a simple five button keypad for all user
input. Press any button and an audible “chirp” confirms
the control input. If a button has no function or is
inappropriate for the situation, an audible “error” is
heard. The unit sounds multiple chirps.
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USING THE 350TX
CONTROL FUNCTIONS
Power. The Power button powers the 350TX up for normal operation.
When the unit is on, POWER turns the unit off. POWER can also be used
to go directly into Simulator mode. To enter simulator, with the unit
powered off, press and hold POWER for several seconds until a continuous
chirp is heard.
Light. LIGHT controls the unit’s display backlight. With the unit powered
on, press LIGHT once to turn the backlight on “high.” Press LIGHT a second
time to turn the backlight on “low,” and a third time turns the backlight
off. The backlight is very effective for low-light and nighttime operation.
When the backlight is on, the 350TX will consume more power than with
the backlight off. This is important when using the 350TX in a portable
configuration powered by a separate battery, or when powering the unit
from a trolling motor battery.
When powering the unit from a battery such as in portable applications,
you can prolong the battery life by using the backlight at a minimum.
The three lower buttons, MENU, UP ARROW, and DOWN ARROW work
together to control the 350TX menu-
controlled user functions.
Menu Heading
Menu. MENU displays a menu on-screen
for adjustment. In normal operation,
pressing MENU repeatedly cycles through
all available menu headings. When a menu heading displays, the full menu
appears after a short pause. A menu remains on-screen for several seconds,
and can be adjusted by using the ARROW keys. If no adjustment is made in
the allotted time, the menu disappears. If you want the menu to remain on-
screen longer press and hold MENU—the menu will remain on-screen
indefinitely. Once you release the menu button, the screen will time out.
Once a menu times out, it is still considered the active menu. Press MENU to
bring up the last menu used.
Arrow Keys. The UP ARROW and DOWN ARROW make adjustments to
menu functions. On the left side of every menu there are UP ARROW and
DOWN ARROW symbols. The symbols indicate which ARROW button has
a function in a particular situation. Either one or both ARROW buttons can
be used to adjust the menu function. A hollow ARROW symbol means the
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USING THE 350TX
CONTROL FUNCTIONS
corresponding ARROW button has no
function. Pressing that button will result in
no adjustment and the “error” audible will
be heard. A solid ARROW symbol means
the corresponding ARROW button can be
used to affect the menu adjustment.
The ARROW buttons often can be used
when no menu is on-screen. In these situations, pressing the ARROW
button affects the function of the active (last-used) menu. This is a short-
cut to menu operation. The menu appears on-screen while the adjustment
is made and times out. A frequently used menu can be adjusted very
quickly using this technique.
After an adjustment is made to a menu function, the menu times out after
a few seconds and the unit returns to normal operation.
Menu Layout. All menus use the same basic layout. The heading at the top
describes the menu function. The UP ARROW and DOWN ARROW symbols
to the left of the menu indicate which buttons are available for adjustment.
In menus that have several possible settings, a range of adjustment indicator
shows the total range available and the current setting.
Within the menu are the options available. The selected option or current
setting is highlighted in the black box. If no adjustment is made, this is the
selected setting. Press an ARROW button while the menu is displayed to
select another option.
Several of the menus are multi-step. In some situations if an adjustment is
made, additional options become available for further adjustment. Examples
of these multi-step menus are Depth Range, Depth Alarm and Zoom. See
the detailed description of each function for further explanation.
Heading
Up Arrow Option
Arrow Symbols
Selected Setting
Down Arrow Option
Range of Adjustment Indicator
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USING THE 350TX
MENU FUNCTIONS
Menu Functions
Sensitivity. The Sensitivity function controls
the sensitivity of the sonar receiver. The
350TX automatically adjusts the level of
receiver sensitivity based on a number of
factors including the depth of the water and
the level of noise present. Noise can be
caused by other electronic devices, engines,
trolling motors, propeller cavitation and
hydrodynamic flow among others.
The user has the option of adjusting the
Sensitivity higher or lower based on personal preference. You can select
one of 11 sensitivity settings from -5 to +5. A setting of 0 (factory setting)
has no effect on the automatic sensitivity control. Increasing the sensitivity
(+1 through +5) enables the unit to display the information from pro-
gressively smaller sonar returns. By decreasing the sensitivity bias
(-1 through -5), the unit effectively filters small sonar returns.
In murky or muddy water, it is often helpful to reduce the sensitivity. This
prevents the display from being
High Sensitivity Low Sensitivity
cluttered with sonar returns from
debris or suspended particles. In very
clear or very deep water, it may be
helpful to increase the sensitivity since
even the smallest sonar return may be
of interest to the user.
To adjust Sensitivity, press MENU
repeatedly until the Sensitivity heading
is displayed. When the Sensitivity menu
appears, use the UP ARROW to
increase the sensitivity, or the DOWN
ARROW to reduce sensitivity. To
sequence through the available
settings, press and hold either ARROW
Sensitivity at “0”
button. Release the button at the
setting you want to change.
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USING THE 350TX
MENU FUNCTIONS
After an adjustment is made, the menu disappears and the new sensitivity
setting is in affect. If additional time is needed to study a menu, press and
hold the MENU button and the menu will remain on-screen indefinitely. If
you need to make an additional adjustment, press the UP ARROW or
DOWN ARROW button.
Depth Range. The Depth Range function
controls the vertical distance displayed on the
graphic area of the display. There are nine
depth ranges available. The top of the range
is always 0, or the surface of the water.
Ranges of 0–5, 0–10, 0–20, 0–40, 0–60,
0–80, 0–110, 0–150, and 0–185 metres. Imperial ranges include: 0–15',
0–30', 0–60', 0–120', 0–180', 0–240', 0–360', 0–480', and 0–600'. The
range that positions the bottom depiction closest to the bottom of the screen,
will best utilize the available display resolution.
The 350TX automatically adjusts the depth range depending on the depth of
the water. The unit tries to maintain the
bottom depiction about ²⁄₃ down the total
range (for example, in 6m (20’) of water, the
0-10m (0'-30’) range would be selected).
This provides the best display resolution and
therefore the best target separation possible.
The Depth Range can be adjusted manually.
Press MENU repeatedly until the Depth
Range menu is visible. Two options are
available: Auto and Manual.
The manual setting enables you to adjust the current depth range setting.
The unit no longer adjusts the Depth Range to the most appropriate range
for bottom display. Often, the bottom
may not be visible on-screen. The digital
depth readout always determines the
depth of the bottom, even if it is not
visible on-screen.
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USING THE 350TX
MENU FUNCTIONS
Using manual Depth Range control, you
can view sonar information from the
area near the surface in great detail.
To return to automatic Depth Range
control, press the MENU button until the
Depth Range menu appears on-screen
and use the UP ARROW to select AUTO.
Zoom. Zoom is similar to Depth Range
because it controls the range of
information displayed on screen. Zoom,
however, allows selection of ranges
beneath the surface so any area of water
between the surface and the bottom can
be enlarged to provide more detailed
information. By using the full display to
show a small area of coverage, the effective
display resolution is increased, and the
unit’s ability to separate close targets is
enhanced.
Depth Range
There are four Zoom ranges available:
2m (7¹⁄₂'), 5m (15'), 10m (30'), and 20m
(60'). These ranges are not directly user
controlled but are instead dependent on
the current depth range. In shallow
water, when the 5m (15') or 10m (30')
range is in use, the Zoom range is
2m (7¹⁄₂'). If the 20m (60') or 40m (120')
range is in use, the Zoom range is
5m (15'), if a 60-150m (180'-480')
depth range is in use, the Zoom range is
30' (10m), and if the 600' (185m) range
is in use, the Zoom range is 60' (20m).
Upper Zoom Limit
The Zoom range is shown on the left side
of the screen and full range information is
shown on the right side of the display.
Zoom can either operate automatically, in
16
Lower Zoom Limit
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USING THE 350TX
MENU FUNCTIONS
which the Zoom range is constantly adjusted to
show the bottom, or manually, in which the user
controls the location of the Zoom range.
Automatic Zoom is especially helpful when looking
for structure or bottom detail. The Automatic
Zoom keeps the bottom in view even in quickly
changing terrain, but is most useful in flatter areas
without considerable depth variation. Manual
Zoom provides detailed information of any area
from the surface to the bottom. In manual Zoom, the Zoom range does not
move as the terrain changes.
When the range is shown in the menu, the upper number represents the top of
the current Zoom range. The lower number represents the bottom of the Zoom
range. Use the UP and DOWN ARROW buttons to move this range. The upper
number can never be less than 0 (the surface of the water), and the lower
number can never be greater than the active depth range. The difference
between the two numbers (the Zoom range) is preset and determined by the
active depth range.
Once manual Zoom is selected, the display appears the same as in Auto Zoom,
but the zoom range does not change automatically.
To disable Zoom, press the MENU button until the Zoom menu is on-screen. Use
the UP ARROW to highlight Off, and let the menu time out.
When the unit is powered off, the Zoom menu returns to Zoom Off.
Depth Alarm. The 350TX contains an aud-
ible alarm to warn you of shallow water
depths. The alarm is adjustable in tenths
(¹⁄₁₀ m) from 1 to 9.9 metres and in full
metres from 10m to 30m (99'). Imperial
measures are set to the whole foot from
3' to 99'. When the alarm is enabled, an
audible alarm sounds if the water beneath
the boat is equal to or less than the selected
alarm depth. The alarm sounds continuously
for about five seconds, and then
intermittently to remind you that you are still
in shallow water.
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USING THE 350TX
MENU FUNCTIONS
Fish Alarm. The Fish Alarm alerts you to
the presence of fish, or other targets not
connected to the bottom. The Fish Alarm
has three different settings that
correspond to the three different size fish
symbols shown on-screen.
The default setting is “OFF.” With the
“Large fish only” setting, the 350TX alarms
on only those targets that are represented
by the large fish symbols. The 350TX can be
set to alarm on only large and medium fish,
or set to alarm on all fish.
Once the Fish Alarm is enabled, the
350TX emits an audible beep when the
selected size fish symbol appears on-
screen.
Set for large fish only
Set for large and medium fish
Set for all fish
Triplog. Triplog provides a running log of
information based on input from the
Temp/Speed sensor.
Since Triplog requires information
from the Temp/Speed sensor to
operate, if this sensor is not detected
by the 350TX, the Triplog menu will
not appear as an option.
Triplog provides seven pieces of information: the current digital depth, water
surface temperature, current boat speed, the distance traveled since the 350TX
was powered up or reset, the average speed, the total time elapsed since
power-up or reset, and the input voltage from your boat’s electrical system.
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USING THE 350TX
MENU FUNCTIONS
Reset to zero time traveled, distance and
average speed.The time, speed and
distance calculations are useful for
tracking your progress on a trip. The input
voltage is useful for determining the
condition of the charging system of the
boat. When used in a portable application
or whenever the 350TX is operated from a
battery source, the voltage number can be
used to determine battery life. The 350TX
will operate at voltages from 10 to 20
VDC. Voltages in excess of 20 or less than
10 VDC cause the unit to power off.
Options. The Options Menu is a series of
linked menu functions used initially to set
your preferences. Once your preferences
are selected, it is unlikely these functions need to
be accessed during the normal operation of the
product.
The Options menu works differently than other
menu functions in that all of the options must be
cycled through in order to return to normal
operation. There are fourteen Option menus:
Contrast, Display Speed, Battery Alarm, Bottom
Black, Fish ID, Numeral Size, Transducer,
Diagnostic, Units, Languages, Speed Offset,
Depth Offset, Filter and Reset.
Contrast. The Contrast function allows the user
to control the level of contrast of the LCD display.
The 350TX will automatically adjust the display
contrast to compensate for changing ambient
temperatures; however, some situations may
occur where manual adjustment will provide a
higher level of contrast.
Eleven contrast settings, +5 to -5, are possible.
The display contrast will change as the
adjustment is made so the optimum level of
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USING THE 350TX
MENU FUNCTIONS
contrast can be achieved. Use the ARROW buttons to highlight the desired
selection. The 350TX will remember the contrast setting if connected to a
transducer, otherwise it resets to the factory setting when the unit is
powered off.
Display Speed. Display Speed controls
the rate at which the graphic information
moves across the display. There are 5
possible speeds; the fastest rate (5) is the
factory setting. Keep in mind that the
closer the update rate matches your boat
speed, the more accurate is the graphic
depiction of the terrain beneath your
boat.
Use the UP and DOWN ARROWS to select the desired update rate. The
Display Speed setting is remembered when the unit is powered off.
Battery Alarm. The Battery Alarm Option allows you to select the voltage
level at which the Battery Alarm activates.
At the Battery Alarm menu (under
options), you will note that the default
setting is OFF. Push the DOWN ARROW
BUTTON to select the feature ON. Push
the DOWN ARROW BUTTON again to
move into the ADJUST BATTERY ALARM
setting. Using the UP and DOWN
ARROW BUTTONS, select a voltage
between 9.0 and 12.0.
When the voltage drops below your selected voltage, an audible alarm
will sound, and a battery alarm icon will be displayed on screen with
current voltage level. The Battery Alarm
setting is remembered when the unit is
powered off.
Bottom Black. There are two selections
available: OFF and ON. The factory
setting is OFF. With this setting, the
350TX displays the bottom using
Structure ID. This allows you to
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USING THE 350TX
MENU FUNCTIONS
determine the texture and relative
Bottom Black View
hardness of the bottom. Selecting
Bottom Black “ON” causes the unit to
blacken in the display below the bottom.
This gives the user easiest recognition of
the bottom location, even from a great
distance.
The 350TX remembers the Bottom Black
setting when powered off.
Fish ID. There are three selections
+
available: OFF, ID ON, and ADJUST. The
+
+
factory setting is ID ON. With Fish ID
OFF, sonar returns are displayed as “raw”
information. There is no interpretation
+
made by the unit. Selecting ID OFF also
disables the fish alarm.
+
ID ON enables the 350TX to interpret the raw sonar data and, using a
variety of techniques, depict appropriate target returns as one of three
different size fish symbols. Further identification shows whether the fish is
in the wide or narrow beam. The
350TX also displays the depth
beneath the surface with the
corresponding fish symbol.
Selecting Adjust and making
incremental changes enhances the
fishfinder’s ability to identify sonar
returns as fish symbols.
Raw Sonar
ID+ On
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USING THE 350TX
MENU FUNCTIONS
Increasing the value to a number greater than zero shows more fish
symbols on-screen. In this case smaller sonar returns will be depicted as fish
symbols. This is useful for identifying many smaller sonar returns (such as
baitfish) as fish symbols.
Decreasing the value to a number less than zero shows fewer fish symbols
on-screen. In this case smaller sonar returns are disregarded. This is useful
for eliminating many small sonar returns when seeking larger species of fish.
The 350TX remembers this selection even when the unit is powered off.
Numeral Size. Two options are available: BIG and SMALL. The factory
setting is BIG. With this setting, the digital depth and speed and temp
numerals are drawn large enough to be read from across the boat. The big
numerals occupy space on the display that
could be used for the graphics area. Hence,
the small numerals option. With small
numerals selected, a greater amount of the
display area is available for the graphic
view. This effectively increases the display
resolution of the unit.
Numeral Size settings are remembered when powered off.
Transducer. The Transducer Option controls the 350TX’s ability to determine the
transducer connected. If you are using the standard tri-beam transducer or wide
side transducer, no adjustment to this menu is needed unless the transducer
develops a fault, which is a rare occurrence. The factory setting for the
Transducer menu is AUTO. The transducer menu selections will be remembered
when the 350TX is turned off.
If a faulty transducer is connected, the
350TX may not change the screen
presentation to match the transducer. In
this instance, you may need to manually
select TRI-BEAM for the tri-beam
transducer or SIDE for the WideSide
transducer.
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USING THE 350TX
MENU FUNCTIONS
Often a transducer switch is used to connect two tri-beams transducers, or a tri-
beam and a wide side to the 350TX. In AUTO the 350TX identifies the
transducer as the switch is changed. Only if the transducer is faulty do you need
to manually identify the transducer in the menu.
The 350TX can work with an older dual beam transducers (model DHS-W only);
however the fishfinder will not show left/right fish location. If this transducer is
being used, leave the menu set to TRI-BEAM. The transducer selection setting
is remembered when the unit is powered off.
When using a dual beam and tri-beam transducer together with a switch, leave
the menu set to TRI-BEAM. When using a dual beam and Wide Side transducer
together with a switch, manually select the correct
transducer in the menu each time the switch is
changed.
Diagnostic. Two options are available: HIDE and
SHOW. The factory setting is HIDE. Selecting SHOW
brings up the Diagnostic screen. See the Using the
Diagnostic Feature section for more information.
Units. The Units function allows the user to select
the units of measurement for the depth and speed
readout. Metres/KTS, (metres/nautical miles per
hour), Metres/KPH (metres/kilometres per hour),
FEET/MPH (feet/statute miles per hour) and FEET/KTS
(feet/nautical miles per hour), are available.The
350TX remembers this selection even when the unit
is powered off.
Languages. There are two language sets
available within the Languages option menu: Set
A – English, French, Italian, German, Norwegian,
Swedish, Spanish, and Finnish. Set B includes:
English, Hungarian, Danish, Polish, Portuguese
and Dutch.To select your language, push the UP
or DOWN ARROW BUTTONS to scroll through
the list. The Languae setting is remembered when the unit is powered off and
the embedded Language Set 350TX A or 350TX B is displayed during startup.
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ADVANCED FEATURES
USING DIAGNOSTIC
Speed Offset. The Speed Offset option allows the
user to compensate for differences in hull design, and
its effect on the accuracy of the speed measurement.
If there is a discrepancy between the indicated speed
and another speed measurement device on the boat,
the speed measurement can be varied to improve
accuracy. Remember, the speed paddle wheel
measures speed through the water, not speed over ground.
Speed offset is remembered after power is disconnected.
Depth Offset. The Depth Offset allows the user to select the point on the boat
from which the depth measurement is made.
Selecting a positive value adds distance to the
measurement. If the transducer is mounted 3 feet
beneath the waterline, a positive 3 will show the
correct depth from the surface of the water.
Another frequent use of depth offset is to show the
depth beneath the deepest point of the hull. A
negative value equal to the distance from the transducer location and the
deepest point of the hull will have the same effect as mounting the transducer
at the deepest point.
Depth offset is remembered after power is disconnected.
Filter. Filter provides an advanced level of control over
the amount of detail visible on-screen and the
sensitivity of the unit. You can choose the setting(s) that
works best for your style of use.
With Filter set to OFF, the fishfinder displays increased
detail, showing more thermoclines, structure, fish and
even your bait when it falls within the sonar cone. However, this extreme sensitivity
requires you to optimize the installation of your unit and transducer so that “noise”
generated by a moving boat is not picked up by the fishfinder.
With Filter set to ON, excessive clutter often caused by interference from other
fishfinders, your boat‘s engine, or from noise generated by the hull at high speeds
is reduced in the display. This provides a cleaner image on the display in most cases.
With the Filter menu on-screen, use the arrow keys to select the setting
for your boat. When finished, press MENU to advance to the next menu.
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ADVANCED FEATURES
USING THE DIAGNOSTIC FEATURE
Reset. With the many User Options available to
customize the 350TX, it is easy to configure the unit
in such a way that it is detrimental to a particular
use. By using the Reset function, all variable or user-
controlled features (except Filter) of the 350TX are
returned to the factory settings.
The Reset function is an important first step in
troubleshooting problems to ensure that a user selected setting is not the
cause for the perceived problem.
USING THE DIAGNOSTIC FEATURE
The 350TX contains a powerful diagnostic tool that
can aid in determining the cause of a problem.
To use the Diagnostic feature, select the Diagnostic
feature on the start-up menu on the initial screen.
Diagnostic can also be accessed through the
Options menu.
Self Test. Initially, the 350TX will perform a self-test.
This test confirms the operation of all internal circuitry.
At the conclusion of the test, one of two messages will
appear. PASSED indicates the internal test discovered no failures, FAILED
indicates a significant internal problem was discovered and the unit requires
factory service. A code number appears that tells
repair personnel where the problem is located.
Transducer Connection. The first connection
tested is Transducer input. If a transducer is
detected, the message CONNECTED appears. If a
series of dashed lines is shown, no transducer is
connected or there is a problem with the transducer
or cable.
If you are using multiple transducers, switch between transducers to confirm
the connections for each.
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ADVANCED FEATURES
USING ALTERNATIVE TRANSDUCERS
Boat Speed/Water Temperature Connection. Other connections tested
include the boat speed and surface water temperature sensors. These accessory
sensors can be purchased independently or together as a single sensor (see the
Humminbird Accessories catalog). If the sensors are connected and working
properly, a “connected” message appears.
The speed input feature only works when the boat is in motion as the paddle
wheel on the speed sensor must rotate to be detected.
Voltage Input. Another connection tested is the voltage input, and is
especially helpful in diagnosing input voltage problems. The current input
voltage is displayed. If voltage fluctuations or power supply in excess of 20 VDC
or less than 10 VDC is suspected, use the diagnostic screen to confirm input
voltage. Often, small outboard motors do not effectively regulate voltage when
operated at high engine speeds.
Use Diagnostic while running the boat at high speeds to show the voltage gain.
Also, if you are using the 350TX in portable configuration or from the trolling
motor battery, Diagnostic can be used to evaluate the health of the battery by
showing the current voltage.
Total Time. The total time category indicates the
total time the unit has been in use since shipped
from the factory. It is normal for some hours to
appear in the total time when the unit is new
due to factory testing. While this is often of
interest to the user, it is primarily a diagnostic
tool for the repair technician should the unit
need service.
USING ALTERNATIVE TRANSDUCERS
Wide side operation
The Wide Side Transducer is a specialized "side-
looking" transducer that is extremely useful for
bank fishing or looking for bait fish in open
water. The Wide Side transducer uses three
different sonar elements that transmit signals to
the left, right and straight down from your boat.
The downward beam is 200 kHz with a 24
degree area of coverage. This beam maintains a
continuous digital depth readout from the
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MAINTENANCE
USING ALTERNATIVE TRANSDUCERS
bottom directly beneath your boat. The side beams
are 455 kHz with a 16 degree area of coverage. The
side-looking elements can be used independently,
or together to locate targets near the surface of the
water on either side of your boat.
The Wide Side transducer can be connected directly
to the 350TX or used in conjunction with the
standard transducer through a transducer switch.
When used with a switch in conjunction with the
Tri-Beam transducer, the 350TX recognizes which
transducer is connected whenever the switch position is changed.
When a Wide Side transducer is connected, the screen display changes to
display the information from the side-looking elements. The Wide-Side
transducer has four views available: Left, Right, Down and Both. These views
are controlled by the View Menu, which is only present when operating in
Wide Side mode. The default view is both, in which information from both the
left and right elements are displayed on screen. The digital depth of the water
beneath your boat is always present.
Viewing both left and right sides simultaneously gives you an excellent tool
when searching for bait fish in open water, or when following a creek bed.
However, you will have a greater display resolution if you view only one side.
The down view is similar to the traditional view when using the standard
transducer, however there is no Tri-Beam information available, such as fish
location.
When operating in Wide Side mode, the range must be adjusted manually, since
the bottom is often not visible on-screen. Ranges of 5m (15'), 10m (30'),
20m (60') and 40m (120') are available. Also, Zoom is not possible in Wide Side
mode, and the Zoom menu is not available.
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MAINTENANCE
MAINTENANCE AND TROUBLESHOOTING
MAINTENANCE
Your 350TX is designed to provide years of trouble free operation with
virtually no maintenance. Follow these simple procedures to ensure your
350TX continues to deliver top performance.
• If the unit comes into contact with salt spray, simply wipe the affected
surfaces with a cloth dampened in fresh water. Do not use a chemical
glass cleaner on the lens. Chemicals in the solution may cause cracking in
the lens of the unit.
• When cleaning the LCD protective lens, use a chamois and non-abrasive,
mild cleaner. Do not wipe while dirt or grease is on the lens. Be careful to
avoid scratching the lens.
• If your boat remains in the water for long periods of time, algae and
other marine growth can reduce the effectiveness of the transducer.
Periodically clean the face of the transducer with liquid detergent.
Pivoting the transducer up in the bracket may allow better access for
inspection or cleaning.
• If your boat remains out of the water for a long period of time, it may take
some time to wet the transducer when returned to the water. Small air
bubbles can cling to the surface of the transducer and interfere with proper
operation. These bubbles dissipate with time, or you can wipe the face of
the transducer with your fingers after the transducer is in the water.
• Never leave the 350TX in a closed car or trunk—the extremely high
temperatures generated in hot weather can damage the electronics.
TROUBLESHOOTING
Do not attempt to repair the 350TX yourself. There are no user serviceable
parts inside, and special tools and techniques are required for reassembly
to ensure the waterproof integrity of the housing. Repairs should be
performed only by authorized Humminbird technicians.
Many requests for repair received by Humminbird involve units that do not
actually need repair. These units are returned “no problem found.” If you
have a problem with your 350TX, use the following troubleshooting guide
before sending your unit in for repair. The 350TX contains several tools that
can aid in determining if there is a problem and how to isolate and repair
the problem in many cases.
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MAINTENANCE
TROUBLESHOOTING
1. Nothing happens when I turn the unit on.
Check the power cable connection at both ends. Be sure the cable is connected
correctly to a reliable power source—red lead to positive, black lead to negative
or ground. Ensure the power available at the mount is between 10 and 20 VDC.
If the unit is wired through a fuse panel, ensure the panel is powered. Often
accessory fuse panels are controlled by a separate switch or the ignition switch.
Also, often a fuse can appear to be good when in fact is not. Check the fuse
with a tester or replace it with a fuse known to be good.
Check the power connection to the 350TX. It is possible to force the power
cable connector into the cable holder incorrectly. If the connector is reversed, the
unit will not work. Examine the contacts on the back of the unit to ensure there
is no corrosion. Finally, ensure the unit is firmly seated on the mount. The
electrical contacts are not made until the unit is fully seated.
Ensure the metal cable retainer is properly installed in the mount. If not, the
power connected may push out when the unit is put on the mount.
2. There is no transducer detected.
The 350TX has the ability to detect and identify that a transducer is connected.
If, at power up, a message indicates “transducer not connected,” only simulator
operation is possible. First, ensure that an appropriate transducer connector is
positioned correctly in the connector holder, and that the unit is fully seated on
the mount. The 350TX will work with the standard tri-beam transducer.
Second, inspect the transducer cable from end to end for breaks, kinks, or cuts
in the outer casing of the cable. Also ensure the transducer is fully submerged
in water. If the transducer is connected to the unit through a switch, temporarily
connect it directly to the unit and try again. If none of these items identifies an
obvious problem, the transducer itself is probably the problem. Be sure to in-
clude the transducer if returning the unit for repair.
3. There is no bottom reading visible on the display.
There are a number of possible causes for this condition. If the loss of
bottom information occurs only at high boat speeds, the transducer needs
adjusting. If the digital depth readout is working but there is no bottom
visible on-screen, it is possible the depth range has been adjusted manually
to a range lower than what is needed to display the bottom. Also, in very
deep water, it may be necessary to manually increase the sensitivity setting
to maintain a graphic depiction of the bottom.
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MAINTENANCE
TROUBLESHOOTING
If you are using a transducer switch to connect two transducers to the 350TX,
ensure the switch is in the correct position to connect a transducer that is in
water. (If a trolling motor transducer is selected and the trolling motor is out of
water, no sonar information appears.)
If none of the above solve the problem, inspect the transducer cable from end
to end for breaks, kinks, or cuts in the outer casing of the cable. If the transducer
is connected to the unit through a switch, temporarily connect it directly to the
unit and try again. If none of these items identifies an obvious problem, the
transducer itself may be the problem. Be sure to include the transducer if
returning the unit for repair.
4. When in very shallow water, I get gaps in the bottom reading and
inconsistent digital depth indication.
The 350TX will work reliably in water 1m (3') or deeper. The depth is measured
from the transducer, not necessarily from the surface.
5. The unit comes on before I press POWER, and won’t turn off.
Check the transducer cable—if the outer jacket of the cable has been cut and
the cable is in contact with bare metal, you need to repair the cut with electrical
tape. If there is no problem with the cable, disconnect the transducer from the
unit and see if the problem is corrected, to confirm the source of the problem.
6. I get gaps in the reading at high speeds.
Your transducer needs adjusting. If the transducer is transom-mounted, there
are two adjustments available to you—height, and running angle. Make small
adjustments and run the boat at high speeds to determine the effect. It may take
several tries to optimize high speed operation. This can also be a result of air or
turbulence in the transducer location caused by rivets, ribs, etc.
7. My unit loses power at high speeds.
Your 350TX has over-voltage protection that turns the unit off when input
voltage exceeds 20 VDC. Some outboard motors do not effectively regulate the
power output of the engine’s alternator and can produce voltage in excess of 20
volts when running at high RPMs. The 350TX displays input voltage in the
Diagnostic screen. Use this readout to determine if the voltage exceeds 20 VDC.
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MAINTENANCE
8. The screen begins to fade out. Images are not as sharp as normal.
Check the input voltage using Diagnostic. The 350TX will not operate on input
voltages below 10 VDC.
9. The display shows many black dots at high speeds and high
sensitivity settings.
You are seeing noise or interference caused by one of several sources.
Noise can be caused by other electronic devices. Turn off any nearby
electronics and see if the problem goes away. Noise can also be caused by
the engine. If engine noise is causing the interference, the problem will
intensify at higher RPMs. Increase the engine speed with the boat
stationary to isolate this cause. Propeller cavitation can appear as noise on-
screen. If the transducer is mounted too close to the propeller, the
turbulence generated can interfere with the sonar signal. Ensure that the
transducer is mounted at least 38cm (15") from the prop.
CUSTOMER SUPPORT
If you have any questions or problems with your Humminbird unit, contact
your local distributor.
Humminbird
108 Maple Lane
Eufaula, AL 36027
USA
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SPECIFICATIONS
Operating Frequency . . . . . . . . . . . . . . . . . . . 200 kHz and 455 kHz
Power Output . . . . . . . . . . . . . . . . . . . . . . . . . . . 300 Watts (RMS)
2400 Watts (Peak to Peak)
Area of Coverage . . . . . . . . . . . . . . . . . . . . . Center: 20° at -10 db
Side Beams: 45° at -10 db
Power Requirement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 VDC
Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FSTN LCD
LCD Matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128 V x 64 H Pixels
Viewing Area . . . . . . . . . . . . . . . . . . . . . . . . . 7.3cm V x 5.97cm H
(2.90" V x 2.35" H)
Mounting . . . . . . . . . . . . . . . . . . . . . . . . . Quick Disconnect Mount
Unit Size . . . . . . . . . . . . . . . . . 17.1cm H x 15.9 cm W x 10.5 cm D
(6³⁄₄"H x 6¹⁄₄"W x 4¹⁄₄"D)
Transducer (Standard) . . . . . . . . . . . . . . . . . . . . . . . . . . XT-6-TB-90
Transducer Cable Length . . . . . . . . . . . . . . . . . . . . . 6 metres (20')
Depth Ranges . . . . . . 5, 10, 20, 40, 60, 80, 110, 150 & 185 metres
(15', 30', 60', 120', 180', 240', 360', 480', & 600')
Zoom Ranges . . . . . . . . . . . . . . . . . . . . . . . . . 2, 5, 10 & 20 metres
(7¹⁄₂', 15', 30', & 60')
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Remove and use for
Transducer
P/N 530976-2
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