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6
The simplified Automatic Radar Plotting Aids (ARPA)
function is designed to help prevent a collision with
other vessels or landmasses.
The radar automatically acquires and plots other
vessels and landmasses that are in the set watch
area. It automatically calculates the closest point
of approach (CPA), and the time to closest point of
approach (TCPA) limit of your vessel and the targets,
and alerts you if there is a danger of colliding with
them.
ARPA Features
•
Only targets in the 0.25 to 16 NM range that are
displayed with a high luminosity (strong return
signal) can be selected as ARPA targets.
•
Up to 30 targets can be acquired and plotted on the
screen, including up to 20 automatically acquired
targets (when the Auto Acquire Function is turned
ON in the Menu screen).
•
Plot positions are identified by an approved symbol
mark (p. 31) and associated plot number.
•
The target and vector line will move across the
screen at the rate and direction defined by the
calculated true or relative course and speed.
•
The vector line is displayed on the target.
The Simplified ARPA function
THE SIMPLIFIED ARPA OPERATION
ARPA operation
D
Turning the simplified ARPA function
ON or OFF
You can set about the simplified APRA function ON or
OFF in the ARPA menu.
[MENU]/[
] > ARPA >
ARPA Function
D
Acquiring a target
1. Move the cross-line cursor onto a target.
2. Push [ACQ]/[
] to set the target for tracking.
•
A dotted circle symbol is displayed on the cursor.
•
After 20 seconds progressing time has passed, a
dotted vector line, the target number is displayed
beside the icon, depending on the “Display Target
Number” setting (p. 32). Then more 40 seconds
has passed, the circle changes to a solid circle and
tracking starts.
•
When the target disappears, a cross mark blinks
on the target, and then the mark disappears after 1
minute.
•
When a target advances within the CPA and TCPA
limits, the mark changes its color to red, blinks, and
sounds an alarm. Push [CLEAR]/[
] to cancel the
alarm.
D
Releasing the acquired target
To release the target, move the cursor onto the target,
then hold down [CLEAR]/[
] for 1 second.
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