6. RADAR
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6.30.2 How to manually acquire a target
You can manually acquire a target from both the radar display and the radar display
overlay.
1. Select an object to acquire. The pop-up menu appears.
2. Select [Acquire].
After you acquire a target, the radar marks the target with a broken square and a vec-
tor appears within 30 seconds. The vector indicates the direction of the target. Within
90 seconds after you acquire the target, the first tracking step is completed and the
target is tracked continuously. At this point, the broken square changes to a solid cir-
cle.
Note 1: For successful acquisition, the target must be within 0.05 to 16 NM from your
ship and not hidden in sea or rain clutter.
Acquisition range for DRS4D-NXT: S1, S2 pulse lengths, 12 NM, M1 - L2 pulse
lengths, 24 NM
Note 2: When the capacity for manual acquisition is reached, you cannot acquire
more targets. Cancel tracking of non-threatening targets to acquire additional targets
manually.
6.30.3 How to automatically acquire a target
Any target that enters the ARPA acquisition area is acquired and tracked automatical-
ly. When a target enters the area, the buzzer sounds.
Note:
1. Select [Guard Zone] from the RotoKey menu.
2. Select [Visible]. The guard zone with dotted lines appears on the screen.
3. Select [Guard Zone] from the RotoKey menu.
4. Select [Resize]. Four circles appear at the four corners of the guard zone.
ARPA
Symbol
Meaning
At acquisition of the target.
30 s after the acquisition, the plotting symbol changes to a small circle,
which indicates steady-state tracking. A vector appears to show the direc-
tion of the target.
A lost target is indicated by a diamond symbol, created from two equal tri-
angles.
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