AP-3
Operation of ARP-10
General
The Auto Plotter ARP-10 is an optional cir-
cuit board which is accommodated in the dis-
play unit of the MODEL 1832, 1932 and 1942
radars.
The Auto Plotter permits manual or automatic
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 alphanu-
meric and by vectors. To ensure the reliabil-
ity of the displayed target data, the radar must
be properly adjusted for minimum sea returns
and noise.
Principal Specifications
Acquisition and tracking:
• Acquisition of up to 10 targets between 0.2
and 16 nm.
• Automatic tracking of up to 10 acquired
targets between 0.1 and 16 nm.
Vectors:
Vector length; 30 s, 1, 3, 6, 15, 30 min.
Orientation; True velocity or relative
velocity
Past positions: 5 past positions at intervals
of 15, 30 s, 1, 2, 3, 6 min.
Alarm: Visual and audible alarms against
targets violating CPA/TCPA
limits, Visual alarm against lost
targets
Target discrimination: A target measuring
about 800 m or more in the radial or circum-
ferential direction is regarded as a landmass
and not acquired or tracked. Echoes smaller
than about 800 m are regarded as true targets.
Keys Used for Auto Plotter
The Auto plotter utilizes the following
touchpad keys. Given below is a brief descrip-
tion of these keys.
MENU: Displays/Erases the main menu.
SELECT/CANCEL:
(Long press) Terminates plotting of the target
selected with the cursor.
(Brief press) Displays the data of target se-
lected with the cursor.
ACQ/ENTER: Acquires the target selected
with the cursor.
ARP-10 MENU Operation
The ARP-10 MENU operation includes the
followings;
Display: Turns on/off the plot symbols, past
positions and target data.
All Cancel: Cancels the tracking of all
targets.
Vector Ref: Selects relative vector or
true vectors. To select your choice, open the
ARP-10 menu, and the legend Rel and True
appear on the "3. Vector Ref" line. Operate
the omnipad. When your selection is in the
reverse video, press the [ACQ/ENTER] key.
Vector Length: Selects vector time.
History: Selects past position plot interval.
CPA Set: Selects CPA alarm limit. When a
target is predicted to come within this limit,
an aural alarm sounds and at the same time
the corresponding target symbol changes to a
blinking triangle.
Note:If the preset CPA limit is set at OFF, a
target which is on collision course will not
produce an alarm.
TCPA Set: Selects TCPA alarm limit.
Auto ACQ: Turns on/off Auto Acquisition
Area.
