Insignia Fish Finder 105SX User Manual

Operations Manual  
®
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TABLE OF CONTENTS  
Section 1: INSTALLATION PREPARATION . . . . . . . . . . . . . . . 2  
Parts Supplied . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2  
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2  
Installation Overview . . . . . . . . . . . . . . . . . . . . . . . . . 2  
Alternative Transducers and Mounting Methods. . . . . . 4  
Transducer Exchange . . . . . . . . . . . . . . . . . . . . . . . . . 5  
Beginning Installation . . . . . . . . . . . . . . . . . . . . . . . . . 5  
Section 2: USING THE 105SX. . . . . . . . . . . . . . . . . . . . . . . 6  
How Sonar Works . . . . . . . . . . . . . . . . . . . . . . . . . . . 6  
Simulator Operation . . . . . . . . . . . . . . . . . . . . . . . . . . 7  
What You See On Screen . . . . . . . . . . . . . . . . . . . . . . 8  
Control Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . 11  
Menu Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14  
Section 3: ADVANCED FEATURES. . . . . . . . . . . . . . . . . . . 21  
Using the Diagnostic Feature. . . . . . . . . . . . . . . . . . . 21  
Section 5: MAINTENANCE AND WARRANTY. . . . . . . . . . . 22  
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22  
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23  
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26  
Service Policy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27  
Customer Resource Center . . . . . . . . . . . . . . . . . . . . 28  
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29  
P/N 531082-1 R11012E  
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INSTALLATION PREPARATION  
PARTS SUPPLIED  
PARTS SUPPLIED  
Before installing your 105SX, please ensure the following parts are  
included in the box:  
• 105SX fishfinder  
Transducer with 20' (6m) of cable and mounting hardware kit  
• Mounting system and mounting hardware kit  
• 6' (2m) power cable  
• Publications kit  
Temperature Probe  
If any of these items is missing, call our Customer Support Hotline.  
ACCESSORIES  
Humminbird offers a wide assortment of accessories that complement  
and expand the capability of your new 105SX. 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 or factory direct through our number listed in  
the Customer Support section.  
INSTALLATION OVERVIEW  
The 105SX 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  
display on the control head. It should be installed in contact with the  
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INSTALLATION PREPARATION  
INSTALLATION OVERVIEW  
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 105SX includes a model XHS- 6-24 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.  
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  
Transom Mounted Transducer  
has similar sonar characteristics 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 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 (not  
included) is required to glue the  
transducer in place.  
Inside the Hull Mounted Transducer  
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INSTALLATION PREPARATION  
ALTERNATE TRANSDUCERS AND MOUNTING METHODS  
ALTERNATE TRANSDUCERS AND MOUNTING METHODS  
The 105SX 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-SPT. 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. 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.  
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.  
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INSTALLATION PREPARATION  
TRANSDUCER EXCHANGE  
TRANSDUCER EXCHANGE  
Other transducers are available as replacements for the standard  
transducer. You may exchange your new and unassembled transducer for  
another type by returning it to the address listed in Customer Support.  
Some transducers may have additional costs. Refer to the Accessory cata-  
log or call Customer Support for information.  
BEGINNING INSTALLATION  
Now that you have determined the transducer mounting method, you  
can begin installation of the 105SX. 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,  
you will need the mounting template in the center 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 boats battery)  
• A 1-amp fuse  
• A fuse holder (if you are wiring directly to the boats battery)  
• Silicone sealant (for sealing drilled holes)  
• 2-part, slow-cure epoxy (for inside the hull transducer installations)  
5
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USING THE 105SX  
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  
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of 600' (185m) and back again in less than / of a second. It is unlikely  
that your boat can "outrun" this sonar signal.  
The 105SX is a 200kHz, single-beam fishfinder. The 200 kHz frequency  
provides excellent sonar resolution (the ability to distinguish small  
returns or returns which are close to the bottom), while providing depth  
capabilities to 600’ (185m). The shape of the sonar beam is symmetrical  
and covers an area of approximately 24 degrees side to side and front to rear.  
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  
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USING THE 105SX  
SIMULATOR OPERATION  
SIMULATOR OPERATION  
The 105SX 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 105SX.  
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 105SX 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” will flash on and  
off in the top center part of the display.  
FEATURE MEMORY  
If your 105SX is installed with a transducer connected, any changes you  
make to the set-up while in Simulator are retained in the units 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 105SX  
WHAT YOU SEE ON-SCREEN  
If you are using the 105SX in Simulator when no transducer is connected,  
any selected options are lost when the unit is powered off. The 105SX  
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 105SX 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 105SX uses a 128 x 64 matrix  
FSTN LCD display. This display provides  
outstanding viewability in all light  
conditions over a wide range of  
temperatures.  
At initial power-up, the 105SX uses  
settings that were set at the factory.  
After initial use, the 105SX will  
remember the settings you enter.  
There are several elements on-screen  
that are common to all modes of  
operation.  
Speed/Temperature. The initial screen layout takes one of two basic forms  
depending on presence of accessories such as Temperature or  
Speed/Temperature sensors. Figure A shows the default view when the  
Speed/Temp or Temperature accessory is installed. Figure B shows the default  
view when no accessory is 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 105SX  
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  
105SX 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  
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3
the bottom representation is typically shown about / down the display.  
Bottom. The graphic depiction of the bottom provides an effective tool for  
understanding the composition of 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  
Surface Clutter  
Rocky Bottom  
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 105SX  
WHAT YOU SEE ON SCREEN  
Structure. Structure is defined as any object physically attached to the  
bottom. The sonar configuration of the 105SX 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 105SX 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  
Thermocline Second Return  
be reflected off the surface of the  
water back to the 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 105SX 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 is 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,  
10  
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USING THE 105SX  
CONTROL FUNCTIONS  
+
ID Fish  
different species of fish have different  
sonar characteristics, so it is not always  
possible to distinguish fish size  
Depth  
between varying species. The signal  
intensity is “normalized” for depth so 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.  
CONTROL FUNCTIONS  
The 105SX 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.  
Power. The Power button powers the 105SX 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 units 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 105SX will consume more power than with the backlight off. This  
is important when using the 105SX in a portable configuration powered by  
a separate battery, or when powering the unit from a trolling motor battery.  
11  
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USING THE 105SX  
CONTROL FUNCTIONS  
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 105SX menu-controlled user functions.  
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  
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 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 twice 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.  
12  
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USING THE 105SX  
CONTROL FUNCTIONS  
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  
13  
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USING THE 105SX  
MENU FUNCTIONS  
Menu Functions  
Sensitivity. The Sensitivity function controls  
the sensitivity of the sonar receiver. The  
105SX 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  
(+)High Sensitivity (-)Low Sensitivity  
sensitivity control. Increasing the  
sensitivity (+1 through +5) enables the  
unit to display the information from  
progressively 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  
Sensitivity at “0”  
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  
button. Release the button at the setting you want to change.  
14  
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USING THE 105SX  
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 0–15', 0–30', 0–60',  
0–120', 0–180', 0–240', 0–360', 0–480' and 0–600' are available. The  
range that positions the bottom depiction closest to the bottom of the  
screen, will best utilize the available display resolution.  
The 105SX automatically adjusts the  
depth range depending on the depth of  
the water. The unit tries to maintain the  
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3
bottom depiction about / down the total  
range (for example, in 20' (6m) of water,  
the 0-30' (0-10m) 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.  
15  
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USING THE 105SX  
MENU FUNCTIONS  
Using manual Depth Range control, you  
can view sonar information from the  
area near the surface in greater 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 units  
ability to separate close targets is  
enhanced.  
Depth Range  
There are four Zoom ranges available:  
1
2
7 / ', 15', 30', and 60'. These ranges  
Upper Zoom Limit  
are not directly user controlled but are  
instead dependent on the current  
depth range. In shallow water, when  
the 15' or 30' range is in use, the  
1
2
Zoom range is 7 / '. If the 60' or 120'  
range is in use, the Zoom range is 15',  
if a 180'-480' depth range is in use,  
the Zoom range is 30', and if the 600'  
range is in use, the Zoom range is 60'.  
16  
Lower Zoom Limit  
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USING THE 105SX  
MENU FUNCTIONS  
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 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.  
17  
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USING THE 105SX  
MENU FUNCTIONS  
Depth Alarm. The 105SX contains  
an audible alarm to warn you of  
shallow water depths. The alarm is  
adjustable to depths of 3' to 99'  
(30m). 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.  
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  
105SX alarms on only those targets  
that are represented by the large  
fish symbols. The 105SX can be set  
to alarm on only large and medium  
fish, or set to alarm on all fish.  
Set for large fish only  
Once the Fish Alarm is  
enabled, the 105SX emits an  
audible beep when the  
Set for large and medium fish  
Set for all fish  
selected size fish symbol appears on-screen.  
18  
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USING THE 105SX  
MENU FUNCTIONS  
Bottom Black. There are two  
selections available: Off and On. The  
factory setting is Off. With this setting,  
the 105SX displays the bottom using  
Structure ID. This allows you to  
determine the texture and relative  
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.  
Bottom Black View  
The 105SX 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 inter-  
pretation made by the unit. Selecting ID  
Off also disables the fish alarm.  
+
ID On enables the 105SX to interpret  
the raw sonar data and, using a variety  
of techniques, depict appropriate  
target returns as one of three different  
size fish symbols. The 105SX also  
displays the depth beneath the surface  
with the corresponding fish symbol.  
Selecting Adjust and making  
incremental changes enhances the  
fishfinders ability to identify sonar  
returns as fish symbols.  
Increasing the value to a number  
greater than zero shows more fish  
19  
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USING THE 105SX  
MENU FUNCTIONS  
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.  
+
Raw Sonar  
ID On  
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 105SX remembers this selection  
even when the unit is powered off.  
Triplog. Triplog provides a running  
log of information based on input  
from the Speed/Temp sensor.  
Since Triplog requires  
information from the Temp or  
Speed/Temp sensors to operate,  
if an accessory sensor is not  
detected by the 105SX, the  
Triplog menu will not appear as  
a control menu.  
Triplog provides seven pieces of  
information: the current digital  
depth, water surface temperature,  
current boat speed, the distance  
traveled since the 105SX was  
powered up or reset, the average  
speed, the total time elapsed since  
power-up or reset, and the input  
20  
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ADVANCED FEATURES  
USING THE DIAGNOSTIC FEATURE  
voltage from your boats electrical system.  
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 105SX is operated from a battery source, the  
voltage number can be used to determine battery life. The 105SX 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.  
USING THE DIAGNOSTIC FEATURE  
The 105SX 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.  
Self Test. Initially, the 105SX 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.  
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.  
Voltage Input. Another connection tested is the voltage input, and is  
21  
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MAINTENANCE AND WARRANTY  
MAINTENANCE  
especially helpful in diagnosing input  
voltage problems. The present 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 105SX in  
portable configuration or from the  
trolling motor battery, Diagnostic can be  
used to evaluate the health of the battery by showing the present  
voltage. Voltage can also be viewed in the Trip Log view.  
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.  
MAINTENANCE  
Your 105SX is designed to provide years of trouble free operation with  
virtually no maintenance. Follow these simple procedures to ensure your  
105SX 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.  
22  
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MAINTENANCE AND WARRANTY  
TROUBLESHOOTING  
•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 105SX 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 105SX 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 105SX, use the following troubleshooting  
guide before calling Customer Support or sending your unit in for repair.  
The 105SX contains several tools that can aid in determining if there is a  
problem and how to isolate and repair the problem in many cases.  
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.  
23  
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MAINTENANCE AND WARRANTY  
TROUBLESHOOTING  
Check the power connection to the 105SX. 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 105SX has the ability to detect and identify that a transducer is  
connected. If, at power up, a message indicates “transducer not connect-  
ed,” 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 105SX will work with the  
standard single 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 include 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.  
If you are using a transducer switch to connect two transducers to the  
105SX, 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  
24  
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MAINTENANCE AND WARRANTY  
TROUBLESHOOTING  
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 105SX will work reliably in water 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 105SX 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 engines alternator and can produce  
voltage in excess of 20 volts when running at high RPMs. The 105SX  
displays input voltage in the Diagnostic screen. Use this readout to  
determine if the voltage exceeds 20 VDC.  
8. The screen begins to fade out. Images are not as sharp as normal.  
Check the input voltage using Diagnostic. The 105SX 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  
25  
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MAINTENANCE AND WARRANTY  
WARRANTY  
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 15" (38cm) from the prop.  
HUMMINBIRD ONE YEAR FULL WARRANTY  
First year repairs (from original date of purchase) on your 105SX are  
absolutely free. This does not include physical damage to the unit or its  
accessory items. Any modification or attempt to repair the original  
equipment or accessories by unauthorized individuals will void the  
warranty. Return the warranty registration card and retain your bill of sale  
for warranty verification. Accessories not manufactured under the  
Humminbird trade name are not covered by our warranty. The customer  
is responsible for shipping charges to Humminbird. Humminbird will  
provide ground UPS or Parcel Post shipping back to the customer free of  
charge. This warranty applies to the original purchaser only.  
This warranty is in lieu of all other warranties expressed or implied and no  
representatives or persons are authorized to provide for any other liability  
in connection with the sale of our products. Humminbird reserves the  
right to perform modifications or improvements on its products without  
incurring the obligation to install the changes on units previously  
manufactured, sold, delivered, or serviced.  
THIS IS A FULL WARRANTY AS DEFINED BY THE FEDERAL WARRANTY  
ACT, EFFECTIVE JULY 4, 1975.  
26  
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MAINTENANCE AND WARRANTY  
SERVICE POLICY  
SERVICE POLICY  
This Service Policy is valid in the United States only. This applies to  
Humminbird units returned to our factory in Eufaula, Alabama, and is  
subject to change without notice.  
All repair work is performed by factory-trained technicians to meet  
exacting factory specifications. Factory serviced units go through the  
same rigorous testing and quality control inspection as new production  
units.  
Even though you’ll probably never need to take advantage of our  
incredible service guarantee, its good to know that we back our units  
this well. We do it because you deserve the best. We will make every  
effort to repair your unit within three working days from the receipt of  
your unit. This does not include shipping time to and from our factory.  
Units received on Friday are usually shipped by Wednesday, units received  
Monday are usually shipped by Thursday, etc.  
We reserve the right to deem any product unserviceable when replace-  
ment parts are no longer reasonably available or impossible to obtain.  
After the original warranty period, a standard flat rate service charge will  
be assessed for each repair (physical damage and missing parts are not  
included). Please call our Customer Support Department to verify the  
service charge for your unit.  
If charges are not prepaid, the unit will be returned C.O.D.  
If you are experiencing problems related to bottom or depth readings,  
please send your transducer along with your unit when sending for repair.  
27  
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MAINTENANCE AND WARRANTY  
CUSTOMER RESOURCE CENTER  
CUSTOMER RESOURCE CENTER  
If you have any questions, call our Humminbird Customer Resource  
Center Hotline:  
1-334-687-0503  
Throughout the U.S. and Canada, hours are Monday-Friday, 8:15 a.m. to  
5:00 p.m. Central time.  
Or visit our web site: www.humminbird.com for Product Support and  
troubleshooting guides.  
If after reading “Troubleshooting” you determine your unit needs factory  
service, please attach a description of the problem and send it with the  
unit to the address below.  
If you are including a check, please attach it to the unit.  
Humminbird  
Service Department  
108 Maple Lane  
Eufaula, AL 36027  
Further information on Humminbird products can be found at:  
28  
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MAINTENANCE AND WARRANTY  
SPECIFICATIONS  
Operating Frequency. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 kHz  
Power Output . . . . . . . . . 2000 Watts (Peak to Peak) - 250 Watts (RMS)  
Area of Coverage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24° at -10 db  
Power Requirement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 - 20 VDC  
Display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FSTN LCD  
LCD Matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128 V x 64 H  
Viewing Area. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.90" V x 2.35" H  
Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . Quick Disconnect Mount  
3
1
1
4
4
4
Unit Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 / "H x 6 / "W x 4 / "D  
Transducer (Standard) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . XHS-6-24  
Transducer Cable Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20'  
Depth Ranges . . . . . . 15', 30', 60', 120', 180', 240', 360', 480', & 600'  
1
2
Zoom Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 / ', 15', 30', & 60'  
29  
Fiberglass  
TOP  
Remove and use for  
Transducer Installation  
Aluminum  
Use ⁵⁄₃₂" drill bit & drill  
two holes for hull type  
Drill  
Drill ●  
Fiberglass  
Fiberglass  
Drill ■  
Drill ■  
Aluminum  
Aluminum  
TOP  
U
s
e
5
/
3
2
"
d
r
i
l
l
b
i
t
Drill  
Drill  
DO NOT LET DEADRISE  
INTERSECT THIS LINE  
PLACE EITHER CORNER  
ON DEADRISE ANGLE  
Level  
15", 40cm  
TOP  
Use 5/32" drill bit  
from prop(s).  
Drill  
Drill  
PLACE EITHER CORNER  
ON DEADRISE ANGLE  
PLACE EITHER ARROW  
ON DEADRISE ANGLE  
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