AUTOMATIC TRACKING AID
ARP-17
MODEL
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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 target’s 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
ZONE” appears. 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
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
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
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
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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