Furuno Answering Machine ARP 17 User Manual

AUTOMATIC TRACKING AID  
ARP-17  
MODEL  
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C
Y o u r L o c a l A g e n t / D e a l e r  
9 - 5 2 , A s h i h a r a - c h o ,  
N i s h i n o m i y a , J a p a n  
T e l e p h o n e :  
T e l e f a x :  
0 7 9 8 - 6 5 - 2 1 1 1  
0 7 9 8 - 6 5 - 4 2 0 0  
F I R S T  
E D I T I O N  
E
:
:
N O V .  
J U L .  
1 9 9 8  
1 0 , 2 0 0 1  
A l l r i g h t s r e s e r v e d .  
Printed in Japan  
P U B . N o . O M E - 3 0 4 6 0  
A R P - 1 7  
( D A M I )  
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SAFETY INSTRUCTIONS  
CAUTION  
The plotting accuracy and response of  
this auto plotter meets IMO standards.  
Tracking accuracy is affected by the  
following:  
WARNING  
No one navigational aid should be relied  
upon for the safety of vessel and crew.  
The navigator has the responsibility to  
check all aids available to confirm  
position. Electronic aids are not  
a substitute for basic navigational  
principles and common sense.  
Tracking accuracy is affected by course  
change. One to two minutes is required to  
restore vectors to full accuracy after an  
abrupt course change. (The actual  
amount depends on gyrocompass  
specifications.)  
The amount of tracking delay is inversely  
proportional to the relative speed of the  
target. Delay is on the order of 15-30  
seconds for high relative speed; 30-60  
seconds for low relative speed.  
This auto plotter automatically tracks an  
automatically or manually acquired radar  
target and calculates its course and  
speed, indicating them by a vector. Since  
the data generated by the auto plotter  
are based on what radar targets are  
selected, the radar must always be  
optimally tuned for use with the auto  
plotter, to ensure required targets will not  
be lost or unwanted targets such as sea  
returns and noise will not be acquired  
and tracked.  
Display accuracy is affected by the  
following:  
Echo intensity  
Radar transmission pulsewidth  
Radar bearing error  
Gyrocompass error  
Course change (own ship or target)  
A target does not always mean a land-  
mass, reef, ships or other surface vessels  
but can imply returns from sea surface  
and clutter. As the level of clutter changes  
with environment, the operator should  
properly adjust the A/C SEA, A/C RAIN  
and GAIN controls to be sure target  
echoes are not eliminated from the  
radar screen.  
i
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TABLE OF CONTENTS  
FOREWORD .................................................................................................................. iii  
OPERATIONAL OVERVIEW  
1. Introduction ...................................................................................................................1  
2. Criteria of Tracking........................................................................................................1  
3. Controls, Menu Description ..........................................................................................3  
4. Activating, Deactivating the ATA ...................................................................................5  
5. Entering Own Ship’s Speed ..........................................................................................5  
6. Acquiring Targets ..........................................................................................................6  
7.Terminating Tracking of Targets .....................................................................................8  
8. Vectors ..........................................................................................................................8  
9. Displaying Target Data..................................................................................................8  
10. Past Position Display ..................................................................................................9  
11. Set and Drift ................................................................................................................9  
12. Alarms .......................................................................................................................10  
13. Track Test (Simulation Display)................................................................................. 11  
14. Diagnostic Sequence ................................................................................................12  
15. Outputting Target Data..............................................................................................13  
SPECIFICATIONS ..................................................................................................SP-1  
INDEX  
ii  
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FOREWORD  
A Word to FURUNO ARP-17 Owners  
FURUNO Electric Company thanks you for considering and purchasing the FURUNO Auto-  
matic Tracking Aid (ATA) ARP-17. We are confident you will discover why FURUNO has be-  
come synonymous with quality and reliability.  
For nearly 50 years FURUNO Electric Company has enjoyed an enviable reputation for effi-  
cient and dependable marine electronics equipment. This dedication to excellence is fur-  
thered by our extensive global network of agents and dealers.  
Your unit is designed and manufactured to meet the rigorous demands of the marine environ-  
ment. However, no machine can perform to the utmost of its ability unless properly operated  
and maintained. Please carefully read and follow the recommended procedures for operation  
and maintenance.  
We would appreciate hearing from you, the end-user, about whether we are achieving our  
purposes.  
Thank you for considering and purchasing FURUNO.  
Features  
The ATAARP-17 is an optional circuit board which is accommodated in the display unit of the  
FR-1500 MARK-3 Series Radars and the FR-1710/1725/1760DS radars.  
The ATA permits manual acquisition and automatic tracking of up to 10 radar targets. An  
internal microprocessor calculates target data such as speeds and courses and displays the  
results in alphanumeric and by vectors.  
When the ARP-17 is installed (whether or not in use), EPA (manual acquisition, manual track-  
ing with 10 selected symbols) is disabled.  
• Manual acquisition of up to 10 targets between 0.2 and 32 nm  
• Automatic tracking of up to 10 manually acquired targets between 0.1 and 32 nm  
• Vector length adjustable and vector reference in true or relative  
• Motion trend displayed within 1 min., full accuracy within 3 min. after acquisition  
• Past position display shows last ten positions.  
• Visual and audible alarms against targets violating CPA/TCPA limits; visual alarms against  
lost targets.  
iii  
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OPERATIONAL OVERVIEW  
Acquisition and tracking  
1. Introduction  
A target which is hit by 5 consecutive radar  
pulses is detected as a radar echo.  
The FR-1500 MARK-3 series radar and the  
FR-1710/1725/1760DS can accommodate an  
optional ATA (Automatic Tracking Aid) mod-  
ule complying with IMO MSC.64(67) Annex  
4 and IEC 60872-2. With the optionalATAcir-  
cuit board (ARP-17) Fitted in the display unit,  
the radar will automatically acquire 10 targets  
coming into the acquisition area. Once a tar-  
get is acquired automatically or manually it is  
automatically tracked within 0.1 to 32 nm,  
whether inside or outside the acquisition area.  
Auto acquisition is not defined in paints but  
in time, which should be less than 3 s of ini-  
tial stage.  
Manual acquisition is done by designating a  
detected echo with the trackball. Automatic  
acquisition is done in the acquisition areas  
when a target is detected 5-7 times continu-  
ously depending upon the congestion. Track-  
ing is achieved when the target is clearly  
distinguishable on the display for 5 consecu-  
tive or alternate paints out of 10 consecutive  
scans whether acquired automatically or  
manually.  
2. Criteria of Tracking  
A target measuring 800 m or more in the ra-  
dial or circumferential direction is regarded  
as a landmass and not acquired or tracked.  
Echoes smaller than 800 m are regarded as  
targets to be tracked.  
Targets not detected in 5 consecutive scans  
become “lost targets.”  
Quantization  
The FURUNO ARPA ATA video processor  
detects targets in midst of noise and discrimi-  
nates radar echoes on the basis of their size.  
Target whose echo measurements are  
greater than those of the largest ship in range  
or tangential extent are usually land and are  
displayed only as normal radar video. All  
smaller ship-sized echoes which are less than  
this dimension are further analyzed and re-  
garded as ships and displayed as small  
circles superimposed over the video echo.  
The entire picture is converted to a digital  
from called “Quantified Video.Asweep range  
is divided into small segments and each  
range element is “1” if there is radar echo  
return above a threshold level, or “0” if there  
is no return.  
The digital radar signal is then analyzed by a  
ship-sized echo discriminator.As the antenna  
scans, if there are 5 consecutive radar pulses  
with 1’s indicating an echo presence at the  
exact same range, a target “start” is initiated.  
Since receiver noise is random, it is not three  
bang correlated, and it is filtered out and not  
classified as an echo.  
When a target is first displayed, it is shown  
as having zero true speed but develops a  
course vector as more information is col-  
lected. In accordance with the International  
Marine Organization Automatic Radar Plot-  
ting Aid (IMO ARPA) requirements, an indi-  
cation of the motion trend should be available  
within 20 scans of antenna and full vector  
accuracy within 60 scans. The FURUNO  
ARPAs/ATAs comply with these require-  
ments.  
The same is true of radar interference. Elec-  
tronic circuits track both the closet and most  
distant edges of the echo. At the end of the  
scanning of the echo, the discriminator indi-  
cates the measured maximum range extent  
and total angular extent subtended by the  
echo. If the echo is larger than a ship-sized  
echo in range extent and/or angular width,  
adjusted as a function of range, it is declared  
1
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to be a coastline and the closet edge is put  
into memory as a map of the area.  
Automatic acquisition areas and  
suppression lines  
This land outline is used to inhibit further ac-  
quisition and tracking of ship sized echoes  
beyond the closest coast outline. 5 consecu-  
tive scans of coastal outline are retained in  
memory to allow for signal variation. All  
smaller echoes are declared to be ship sized  
and the middle of the leading edge is used to  
provide precise range and bearing coordi-  
nates of each echo on every scan. This  
range/bearing data is matched to previous  
data and analyzed from scan-to-scan for con-  
sistency. When it is determined to be as con-  
sistent as a real target, automatic acquisition  
occurs and tracking is initiated.  
Performance of auto-acquisition is enhanced  
by controlling the limit lines (suppression  
lines) in the former series of FURUNO  
ARPAs. In the ATA, the automatic acquisi-  
tion rings are used instead of the limit lines.  
Auto acquisition rings work as suppression  
lines when viewed from the opposite direc-  
tion. The should be placed clear of a land-  
mass or shoreline. The acquisition areas may  
be a full 360 degree circle or sector of any  
angles. They are gyro stabilized.  
Qualitative description of tracking  
error  
Continued tracking and subsequent calcula-  
tion develop the relative course and speed  
of the target just as a man would do when  
plotting the relative course and speed of the  
target on the scope with a grease pencil.  
The FURUNO ATA accuracy complies with  
or exceed IMO standards.  
Own ship maneuvers  
The true course and speed of own ship are  
computed from own ship’s gyro and speed  
inputs, and the resulting course and speed  
of each tracked target is easily computed by  
vector summing of the relative motion with  
own ship’s course and speed. The resulting  
true or relative vector is displayed for each  
of the tracked targets. This process is up-  
dated continually for each target on every  
scan of the radar.  
For slow turns there is no effect. For very high  
turning rates (greater than 150°/minute, de-  
pending on gyro), there is some influence on  
all tracked targets which last for a minute or  
two and then all tracked targets revert to full  
accuracy.  
Other ship maneuvers  
Target ship courses, lag 15 to 30 seconds at  
high relative speed, or 3 to 6 seconds at low  
(near 0) relative speed. It is less accurate  
during a turn due to lag, but accuracy recov-  
ers quickly.  
2
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3. Controls, Menu Description  
Controls  
1
2
3
4
5
6
7
8
9
0
MODE  
[PLOT SYMBOL] key: Manually acquires a target.  
TGT  
TRAIL  
GZ  
ALARM  
SHIFT  
ZOOM  
INDEX  
LINE  
EBL  
OFFSET  
[MENU] key: Opens/closes menu.  
MARK  
F
F
1
2
[CANCEL/CLEAR] key: Cancels item selected.  
BRILL  
A/C RAIN  
TLL (PUSH)  
A/C SEA  
GAIN  
TX  
STBY  
OFF  
ON  
OFF  
ON  
EBL  
VRM  
POWER  
DAY/NIGHT (PUSH)  
A/C AUTO (PUSH)  
HL OFF (PUSH)  
RANGE  
ON  
OFF  
BKGND  
COLOR  
FUNC  
TION  
DIMMER  
RINGS  
[ENTER/SELECT] key: Registers selection; displays data  
of target selected.  
DEGAUSS (PUSH)  
[AUDIO OFF] key: Silences CPA/TCPA alarm.  
FR-1500 MARK-3 SERIES DISPLAY UNIT  
[MENU] key: Opens/closes menu.  
[CANCEL/CLEAR] key: Cancels item selected.  
[ENTER/SELECT] key: Registers selection; displays data  
of target selected.  
[ACQ] key: Manually acquires target.  
[AUDIO OFF] key: Silences CPA/TCPA alarm.  
FR-1710/1725/1760DS DISPLAY UNIT  
Figure 1 Display unit of the FR-1500 MARK-3 series, FR-1710/1725/1760DS  
3
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Menu tree  
[MENU] key  
1. VIDEO PLOT  
2. TGT TRAIL  
3. TGT ALARM  
4. WATCH TIM (PANEL DIM shown on FR-1710/1725/1760DS.)  
5. ECHO SIG  
6. FUNC  
7. PLOT  
8. MARK  
9. BRILL  
0. OTHER  
1. MARK DISP (OFF/ON)  
2. ERASE  
3. VECT REF (REL/TRUE)  
4. VECT TIME (30S/1/3/6/15/30MIN)  
5. CPA SET (OFF/0.5/1/1.5/2/3/4/5/6NM)  
6. TCPA SET (30S/1/2/3/4/5/6/12/15MIN)  
7. TRACK (ON/OFF)  
PLOT MENU 1  
8. AUDIO ALARM (OFF/ON)  
9. INTVAL (30S/1/2/3/6MIN)  
0. ↓  
1. ↑  
2. AUTO ACQ (OFF/ON/SET)  
3. GUARD ZONE (OFF/ON/SET)  
4. TRACK TEST  
PLOT MENU 2  
5. LAND DISCRIM (0/1/2/3/4)  
6. TTM (OFF/REL/TRUE)  
7. VECT START (1MIN/20SCAN)  
8. REF TGT VECTOR (OFF/ON)  
9. TARGET BASED SPEED  
Figure 2 Menu tree  
Menu description  
Table 1 Menu description  
Menu Item  
PLOT MENU 1  
Function  
1. MARK DISP  
2. ERASE  
Turns target data display on/off.  
Erases all plot symbols.  
3. VECT REF  
4. VECT TIME  
5. CPA SET  
6. TCPA SET  
7. TRACK  
Selects vector reference; true or relative.  
Sets vector time.  
Sets CPA alarm range.  
Sets TCPA alarm range.  
Turns past position display on/off.  
Turns audio alarm on/off.  
8. AUDIO ALARM  
9. INTVAL  
Selects past position display plotting interval.  
Go to PLOT MENU 2.  
0. ↓  
PLOT MENU 2  
1. ↑  
Go to PLOT MENU 1.  
2. AUTO ACQ  
3. GUARD ZONE  
4. TRACK TEST  
Sets an automatic acquisition area.  
Sets a guard zone.  
Tests ATA processor for proper operation.  
Sets size of echo to be recognized as landmass. The  
larger the figure the larger the landmass. Default setting  
is "2".  
5. LAND DISCRIM  
6. TTM  
Turns target data output on/off.  
7. VECT START  
8. REF TGT VECTOR  
Start displaying a vector after 20 scans.  
Turns vector display on/off for reference target.  
9. TARGET BASED SPEED Selects reference target(s).  
4
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Automatic speed input  
4. Activating, Deactivating  
the ATA  
1. Press [MENU], [0], [0] to display the  
OTHER menu.  
TheATAis activated/deactivated through the  
menu.Acquired targets are tracked internally  
when the ATA is deactivated.  
OTHERS  
1. HDG SET  
1. Adjust the A/C RAIN, A/C SEA and GAIN  
controls for proper radar picture.  
2. SPD MODE  
MAN LOG NAV*  
LOG (S-BT)  
LOG (S-WT)  
2. Press [MENU], [7], [7] to show PLOT  
MENU 1.  
3. MAN SPD  
4. SET & DRIFT  
5. DISPLAY  
6. MARK/LINE  
7. TUNE  
PLOT MENU 1  
1. MARK DISP  
2. ERASE  
OFF ON  
3. VECT REF  
4. VECT TIME  
(min)  
REL TRUE  
8. NAV DATA  
9. EBL/VRM/+  
0. ↓  
30S  
15  
1
3
6
30  
5. CPA SET  
OFF 0.5NM 1NM 1.5NM  
2NM  
5NM  
30S  
4
3NM 4NM  
6NM  
* NAV shown on R-type only.  
6. TCPA SET  
(min)  
1
5
2
3
6
12  
15  
Figure 4 OTHER menu  
7. TRACK  
8. AUDIO ALARM  
9. INTVAL  
(min)  
OFF ON  
OFF ON  
2. Press the [2] key to select a LOG option  
or NAV from the SPD MODE field.  
30S  
1
2
3
6
0. ↓  
LOG: Pulse input from speed log  
NAV: Speed data from nav equipment  
Figure 3 PLOT MENU 1  
LOG(S-BT): Speed over ground, serial  
data from speed log  
3. Press the [1] key to select ON or OFF from  
the MARK DISP field.  
LOG(S-WT): Speed relative to water,  
serial data from speed log  
4. Press the [ENTER/SELECT] key.  
5. Press the [MENU] key to close the menu.  
3. Press the [ENTER/SELECT] key.  
4. Press the [MENU] key to close the menu.  
Notes:  
Note: The ATA plot is automatically turned  
on whenever the automatic acquisition area  
or guard ring is activated or a target is se-  
lected for target-based speed input.  
1) IMO Resolution A.823(19) for ARPA rec-  
ommends that a speed log to be inter-  
faced with an ARPAshould be capable of  
providing through-the-water speed. This  
shall apply to the ATA operation as well.  
5. Entering Own Ship’s  
Speed  
2) Be sure not to select LOG when a speed  
log is not connected. If the log signal is  
not provided, the ship’s speed readout at  
the screen top will be blank.  
TheATArequires own ship’s speed and head-  
ing data. Of these, the speed data can be  
entered automatically from a speed log,  
navaid or manually through the menu.  
3) SPEED xx.x and “SIGNAL MISSING  
LOG” appear if no log signal is present  
for 30 seconds.  
Note: It is customary to use a speed relative  
to water for collision avoidance and a speed  
over the ground for navigation purpose.  
5
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The reference target mark (dashed square)  
appears at the cursor position and the own  
ship data label changes from LOG, NAV or  
MAN to REF. Note that it takes 60 scan be-  
fore a new speed is displayed, indicated by  
the target mark changing to a circle. If track-  
ing has failed for a reference target, the tar-  
get is marked with a lost target mark (symbol  
formed with two triangles).  
Manual speed input  
Select MAN at step 2 above, press the [3]  
key twice, and enter speed with the ten keys.  
Target-based speed input  
This mode is used when the ship’s SDME  
(log) is not operating properly, ship’s speed  
is changed minutely (in case of no log), or  
the vessel has no device which detects ship’s  
leeward movement (doppler sonar 2-axis  
speed log, etc.) and leeward movement is  
not disregarded. You may select up to three  
targets, and they are marked as R1, R2, R3.  
They appear as tracked targets, each shown  
in a small circle, but without a vector. When  
a plural number of objects is selected, the  
mean value is used for stabilization and  
speed.  
6. Acquiring Targets  
The ATA permits automatic acquisition (10  
targets) plus manual acquisition (10 targets),  
or fully manual acquisition (20 targets) within  
a range of 0.2 to 32 miles. The targets are  
automatically numbered and the same num-  
bers are not used more than once until the  
maximum capacity is reached.  
Note 1: TheATAcalculates own ship’s speed  
relative to a fixed target. Therefore, when  
selecting a target, a larger ground mass or a  
long coast line is not suitable as a reference  
target because of obscure reference point.  
Before starting the ATA, check that heading  
and speed readouts at the top of the screen  
are correct.  
Manual acquisition  
Note 2: Avector can be displayed for the ref-  
erence target. This can be done with TAR-  
GET BASED SPEED on PLOT MENU 1.  
1. Place the cursor (+) on a target of inter-  
est by operating the trackball.  
2. Press the [PLOT SYMBOL] key ([ACQ]  
key on the FR-1710/1725/1760DS).  
Note 3: If a tracked target is acquired as a  
reference target it will become a lost target  
and cannot be reacquired. Therefore, when  
acquiring a reference target, select a target  
which is not being tracked. To select a tracked  
target as a reference target, cancel tracking  
and then acquire it as a reference target.  
The plot symbol changes its shape accord-  
ing to the status as below, with plot number  
to the right of the plot symbol. A vector ap-  
pears in about 20 antenna scans after acqui-  
sition indicating the target’s motion trend. If  
the target is consistently detected for three  
minutes, the plot symbol changes to a solid  
mark. If acquisition fails, the target symbol  
blinks and disappears shortly.  
1. Select a small ground mass target (small  
island, lighthouse) 0.2 to 24 nautical miles  
from own ship.  
2. Place the cursor on the target.  
3. Press [MENU], [7], [7], [0], [0], [9], [9].  
4. Place the cursor on the target and press  
the [PLOT SYMBOL] key ([ACQ] key on  
the FR-1710/1725/1760DS).  
5. Press the [MENU] key.  
6
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PLOT SYMBOLS  
A
A
R
1
1
Reference Immediately  
Target After  
(Received Acquisition  
reliable  
B
referencing)  
B
Sector  
1
1
20 scans  
after  
acquisition  
60 scans after  
acquisition  
(Steady tracking)  
0.5nm  
1
1
Figure 6 Automatic acquisition area  
Target which Target on  
is being  
plotted  
collision course  
(CPA/TCPA)  
Note: If you wish to create an auto acquisi-  
tion area having a 360 degree coverage  
around own ship, set point B in almost the  
same direction (approx. ±5°) as point A and  
press the [ENTER/SELECT] key.  
1
1
Lost Target Target in GZ  
Figure 5 Plot symbols  
Changing plot symbol shape  
CAUTION  
TARGET SWAP  
The plot symbol for a target may be changed  
after acquiring the target, on the R-type ra-  
dar only.  
When a tracked target near another tracked  
target, the targets may be "swapped."  
When two targets come close to each  
other, one of the two can become a "lost  
target." Should this happen, reacquisition  
of the "lost target" is required after the two  
targets have separated.  
1. Place the cursor on the plot symbol mark  
you wish to change.  
2. Press the [ENTER/SELECT] key succes-  
sively while pressing and holding down  
the [HL OFF] control to select plot sym-  
bol mark desired.  
Automatic acquisition  
1. Press [MENU], [7], [7] to display PLOT  
MENU 1.  
Plot symbols  
2. Press the [0] key twice.  
Note: Changing the plot symbol mark  
while a target is under acquisition (target  
marked with dashed square) will cause  
all plot symbol marks above to be shown  
with dashed lines.  
3. Press the [2] key to select SET from the  
AUTO ACQ field.  
4. Press the [ENTER/SELECT] key.  
5. Place the cursor at upper (lower) left edge  
of area and press the [ENTER/SELECT]  
key.  
3. To inscribe a smaller plot symbol mark,  
place the cursor on any plot symbol, then  
press the [ENTER/SELECT] key. Mark  
size can be alternately selected to large  
or small by repeating this step.  
6. Place the cursor at the lower (upper) right  
edge of the area and press the [ENTER/  
SELECT] key.  
7
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The vector tip shows an estimated position  
of the target after the selected vector time  
elapses. It can be valuable to extend the vec-  
tor length to evaluate the risk of collision with  
any target.  
7. Terminating Tracking of  
Targets  
When the ATA has acquired 10 targets, no  
more acquisition occurs unless targets are  
lost. Should this happen, cancel tracking of  
individual targets or all targets by the proce-  
dure described below.  
Vector start time  
Whenever the range is changed the vectors  
for tracked targets is reestablished. You can  
select when to start reestablishment of the  
vectors with VECT START on the PLOT  
MENU 2 menu. The operator has the choices  
of 1 min or 20 scans.  
Individual targets  
Place the cursor (+) on a target which you do  
not want to be tracked any longer by operat-  
ing the trackball and press the [CANCEL/  
CLEAR] key.  
9. Displaying Target Data  
All targets  
The ATA calculates motion trends (range,  
bearing, course, speed, CPA and TCPA) of  
all targets under tracking, and displays data  
of selected target at the top right corner of  
the screen.  
All targets can be canceled from PLOT menu  
as follows.  
1. Press [MENU], [7], [7] to show PLOT  
MENU 1.  
2. Press the [2] key twice to select ERASE.  
3. Press the [ENTER/SELECT] key.  
4. Press the [MENU] key.  
Note: At a speed under 5 kt the target data is  
displayed with a delay due to filtration pro-  
cessing.  
Approx. position  
of target after  
elapse of vector time  
8. Vectors  
Vector Time  
True or relative vector  
Vector  
Target vectors are displayed in relative or true  
mode. Own ship does not have a vector in  
relative mode. You may select true or rela-  
tive vector with VECT REF on PLOT MENU  
1 menu.  
Plot Symbol  
RNG 5.25NM  
BRG 182.2° T  
CSE 42.2° T  
SPD 8.6KT  
CPA 8.3NM  
TCPA 45:32  
Note: The indication TRUE VECTOR ap-  
pears in red characters when the true vector  
is selected on relative motion displays.  
Range at CPA  
Time to CPA  
Figure 7 Target data example  
Vector time  
From PLOT MENU 1, VECT TIME (or the  
length of vectors) can be set to 30 seconds,  
1, 3, 6, 15 or 30 minutes and the selected  
vector time is indicated on the screen.  
8
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2. Press the [7] key to select ON or OFF from  
the TRACK field.  
Displaying data  
Place the cursor on a wanted target and press  
the [ENTER/SELECT] key. Data on the se-  
lected target is displayed on the screen. The  
data includes the follows;  
BRG/RNG (Bearing/Range): RNG/BRG  
(Range/Bearing): Range and bearing from  
own ship to the selected target with suffix “T”  
(True) or “R” (Relative).  
(a) Ship turning  
(b) Ship running  
straight  
CSE/SPD (Course/Speed): Course and  
speed are displayed for the selected target  
with suffix “T” (True) or “R” (relative).  
(c) Ship reduced  
speed  
(d) Ship increased  
speed  
CPA (Closest Point of Approach) is the clos-  
est range a target will approach to own ship.  
Do not mix it with the operator preset CPA  
alarm limit.  
Figure 8 Past position display examples  
Selecting plotting interval  
TCPA is the time to CPA measured with  
present speeds of own ship and the targets.  
Both CPA and TCPA are automatically cal-  
culated. When a target ship has passed clear  
of own ship, the CPA is displayed and the  
TCPAappears as “xx.x”. TCPAis counted up  
to 99.59 min. and beyond this it is indicated  
as TCPA>99.59 min.  
On PLOT MENU 1, select desired past posi-  
tion display plotting interval among 30 sec, 1  
min, 2 min, 3 min or 6 min from 9. INTVAL.  
11. Set and Drift  
Note 1: MARK DISP on PLOT MENU 1 must  
be turned on to display target data.  
Set, the direction of ocean current, can be  
manually entered in the nearest degree. Drift,  
the speed of current, can also be entered  
manually, in 0.1 knot increments. Set and drift  
corrections are beneficial for increasing the  
accuracy of the vector data. The correction  
is best made on relative motion with true vec-  
tor, watching landmasses, buoys, or station-  
ary targets. Thus, the speed and course of  
own ship over the ground are reciprocally  
calculated and compared with the relative  
bearing and range to the reference target to  
produce a Set and Drift. These values are  
applied to all targets. If stationary objects  
have vectors, the set and drift should be cor-  
rected until they lose their vectors.  
10. Past Position Display  
The ATA displays equally time-spaced dots  
(maximum 10 dots at intervals of 30 s, 1, 2, 3  
or 6 min) marking the past positions of any  
targets being tracked.  
If a target changes its speed, the spacing will  
be uneven. If it changes the course, its plot-  
ted course will not be a straight line in TM  
mode. In TM, the past position display is pro-  
duced relative to North (True Trails). In RM,  
it is relative to North or Heading as selected.  
If own ship is equipped with a device to indi-  
cate ocean current movements, the values  
shown on it may be used.  
To turn the past position display on/off:  
1. Press [MENU], [7], [7] to display PLOT  
MENU 1.  
1. Press [MENU], [0], [0] to display the  
OTHER menu.  
9
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OTHERS  
12. Alarms  
1. HDG SET  
CPA/TCPA alarm  
2. SPD MODE  
MAN LOG NAV*  
LOG (S-BT)  
Visual and audible alarms are generated  
when the predicted CPA and TCPA of any  
target become less than their preset limits.  
Press the [AUDIO OFF] key to acknowledge  
and silence the CPA/TCPA audible alarm.  
LOG (S-WT)  
3. MAN SPD  
4. SET & DRIFT  
5. DISPLAY  
6. MARK/LINE  
7. TUNE  
TheATAcontinuously monitors the predicted  
range at the Closest Point ofApproach (CPA)  
and predicted time to CPA (TCPA) of each  
tracked target to own ship.  
8. NAV DATA  
9. EBL/VRM/+  
0.  
When the predicted CPA of any target be-  
comes smaller than a preset CPAalarm range  
and its predicted TCPA less than a preset  
TCPA alarm limit, the ATA releases an au-  
dible alarm. In addition, the target plot sym-  
bol changes to a triangle and flashes together  
with its vector.  
* NAV shown on R-type only.  
Figure 9 OTHER menu  
2. Press the [4] key twice to select SET/  
DRIFT.  
SET & DRIFT  
Provided that this feature is used correctly, it  
will help prevent the risk of collision by alert-  
ing you to threatening targets. It is important  
that GAIN, A/C SEA, A/C RAIN and other  
radar controls are properly adjusted and the  
ATA is set up so that it can track targets ef-  
fectively.  
1.  
2. SET/DRIFT  
3. SET  
OFF ON  
000.0  
4. DRIFT  
0-19.9 KT  
Figure 10 SET/DRIFT menu  
3. Press the [2] key to select ON from the  
SET DRIFT field, and then press the [EN-  
TER/SELECT] key.  
CPA/TCPAalarm ranges must be set up prop-  
erly taking into consideration the size, ton-  
nage, speed, turning performance and other  
characteristics of own ship.  
4. Press the [3] key twice, enter SET value,  
and then press the [ENTER/SELECT]  
key.  
The CPA/TCPA alarm feature should never  
be relied upon as a sole means for detecting  
the risk of collision. The navigator is not re-  
lieved of the responsibility to keep visual look-  
out for avoiding collisions, whether or not the  
radar or other plotting aid is in use.  
5. Press the [4] key twice, enter DRIFT  
value, and then press the [ENTER/SE-  
LECT] key.  
6. Press the [MENU] key.  
Follow the steps shown below to set the CPA/  
TCPA alarm ranges:  
1. Press [MENU], [7], [7] to display PLOT  
MENU 1.  
2. Press [5] (CPA SET) to select CPA limit  
desired from the CPA SET line.  
3. Press the [ENTER/SELECT] key.  
4. Press [6] (TCPA SET) to select a TCPA  
limit desired.  
10  
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5. Press the [ENTER/SELECT] key.  
To disable the guard ring, select OFF at step  
4 in the above procedure and press the [EN-  
TER/SELECT] key.  
6. Press the [MENU] key to close the menu.  
0.5 mile  
Silencing CPA/TCPA audible alarm  
Press the [AUDIO OFF] key to acknowledge  
and silence the CPA/TCPA audible alarm.  
A
The flashing of the triangle plot symbol and  
vector remain on the screen until the dan-  
gerous situation is no longer present or you  
intentionally terminate tracking of the target  
by using the [CANCEL/CLEAR] key.  
B
Figure 11 Guard zone  
13. Track Test  
Lost target alarm  
(Simulation Display)  
When the system detects a lost target, track-  
ing on the target is discontinued and the tar-  
get symbol becomes a flashing diamond ( ).  
The normal plotting symbol is restored to the  
target when the target is manually acquired.  
If the target is not reacquired the flashing dia-  
mond will be erased from the screen.  
The simulation display tests the ATA proces-  
sor for proper operation. The figure below  
shows the starting picture of the simulation  
display. Each mark moves as time passes.  
Check that each targets data is reasonable.  
Do this test when the radar is not being  
used.  
Confirming lost target  
6
1. Place cursor on target.  
3
5
4
2. Press the [CANCEL/CLEAR] key.  
1
Guard zone alarm  
2
When a target comes in the guard zone, the  
buzzer sounds and the indication GUARD  
ZONEappears. The intruding target is de-  
noted by an inverted triangle mark. The mark  
disappears when the target exits the zone.  
XX  
7
Figure 12 Track test display  
You can set the guard zone as follows:  
1. Press [MENU], [7], [7], [0], [0], [4], [4].  
1. Press the [MENU], [7], [7] to display PLOT  
MENU 1.  
2. Press the [ENTER/SELECT] key to start  
the test.  
2. Press the [0] key twice.  
3. It takes approximately three minutes for  
all vectors to be displayed completely on  
the screen. The simulation display does  
not need radar, gyrocompass nor speed  
log input; seven targets on various  
courses and speeds are provided.  
3. Press the [3] key to select GUARD ZONE.  
4. Press the [3] key again to select SET and  
press the [ENTER/SELECT] key.  
5. Set the cursor on one boundary of the  
guard ring and press the [ENTER/SE-  
LECT] key. Set the cursor on the other  
boundary and press the [ENTER/SE-  
LECT] key.  
11  
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14. Diagnostic Sequence  
Target  
Target 1  
Target 2  
Target 3  
Target 4  
Target 5  
Target 6  
Target 7  
* Initial data  
Course  
90.0° R  
0.0° R  
Speed  
10.0 kt  
0.0 kt  
CPA*  
1.0 nm  
4.0 nm  
1.7 nm  
0.9 nm  
6.0 nm  
0.0 nm  
4.0 nm  
TCPA*  
10.4 min  
You can check the ATA Board for proper op-  
eration as follows. The self test does not re-  
quire operator intervention. It runs  
automatically when the power is placed on  
at regular intervals or on operator demand.  
180.0° R  
216.5° R  
273.5° R  
180.0° R  
24.6° R  
10.0 kt  
23.8 kt  
14.2 kt  
20.0 kt  
15.6 lkt  
28.2 min  
15.0 min  
22.5 min  
30.0 min  
43.6 min  
1. Press [MENU], [0], [0], [0], [0].  
2. Press the [2] key twice to start the diag-  
nosis sequence. The results of the test  
appear as shown below.  
4. The simulation continues for five minutes  
and then repeats. To quit the test se-  
quence, turn the TRACK TEST off on the  
PLOT MENU2.  
FR-1500 M-3 Series Test  
1. Program No.  
2. ROM Check  
3. RAM Check  
03591521**  
OK  
OK  
4. Antenna Rotation  
24RPM  
5. Tx Trigger Frequency 3000Hz  
6. Video Level  
7. Video Signal  
8. Navigation I/O 1  
9. Navigation I/O 2  
000  
OK  
OK  
OK  
10. NMEA Heading IN OK  
11. LOG Pulse IN  
OK  
ARP TEST  
1. Program No. 18590411** 18590421**  
2. ROM Check  
3. RAM Check  
4. Speed Log  
5. Course  
OK  
OK  
OK 0.0 KT  
OK  
OK  
6. Trigger  
OK  
7. Video Signal  
8. Bearing Pulse  
9. Heading Pulse  
10. Minimum  
11. Scan Time  
12. Manual Acq.  
13. Auto Acq.  
14. FE-Data 1  
15. FE-Data 2  
OK  
OK  
OK  
0003  
0274  
00  
00  
0000  
0000  
Press MENU key to escape.  
Press ENTER to check CRT.  
** Program No.  
Figure 13 Diagnostics test results  
(FR-1500 MARK-3 series)  
3. If NG appears for any ATA-related item,  
call for service.  
4. To escape, press the [MENU] key.  
12  
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15. Outputting Target Data  
Target data may be output to external equip-  
ment as follows:  
1. Press [MENU], [7], [7], [0], [0].  
2. Press the [6] key to select OFF, REL or  
TRUE from the TTM field as appropriate.  
3. Press the [ENTER/SELECT] key followed  
by the [MENU] key.  
Target data contain as follows;  
Target number  
Target distance from own ship  
Bearing from own ship, True or relative  
Target speed  
Target course, true or relative  
CPA and TCPA  
13  
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SPECIFICATIONS OF AUTO PLOTTER  
ARP-17  
1. GENERAL  
(1) Functions  
Calculation/indication of own ship speed relative to a fixed target  
Manual target acquisition, automatic tracking  
Target information:  
Distance and bearing from own ship to target  
Moving direction and speed  
History presentation  
(2) Acquisition and Tracking  
Manual acquisition by trackball and cursor  
Maximum number of targets: 10  
Acquisition range: 0.2 to 32 nm  
Tracking range: 0.1 to 32 nm  
(3) Vector  
(4) History  
(5) Alarms  
Vector length: 30 sec; 1, 2, 3, 6, 15, 30 min  
Mode: true velocity or relative velocity  
plotting interval: 30 sec; 1,2,3,6 min  
Number of plotting points: 10 per target  
Visual and audible alarm against target violating CPA/TCPA limits  
Visual and audible alarm against guard-zone limits (5 targets max.)  
Visual alarm against lost target, target full and system failure  
(6) Compatible Radar  
FR-1700 series, FR-1500 Mark-3 series  
SP - 1  
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INDEX  
A
P
Activating ATA 5  
Alarms  
Past position display 9  
Plot symbol mark 7  
CPA/TCPA alarm 10  
Guard zone alarm 11  
lost target alarm 10  
Automatic speed input 5  
S
Set and drift 9  
Ship's speed  
target-based speed 6  
Speed input  
C
Control description 3  
CPA/TCPA alarm 10  
automatic 5  
manual 6  
D
T
Deactivating ATA 5  
Diagnostic test 12  
Target acquisition  
automatic 7  
manual 6  
Target data  
G
displaying 8  
output 13  
Guard zone alarm 11  
Target tracking termination 7  
Target-based speed input 6  
Track test 11  
L
Lost target alarm 10  
M
V
Manual speed input 6  
Menu tree 4  
Vectors  
time 8  
true, relative 8  
Index-1  
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