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3. ARP OPERATION
3-3
3.4 Acquiring and Tracking Targets
Ten targets may be acquired and tracked manually and automatically. When you attempt to
acquire an 11th target, the message "ARP FULL - ALREADY TRACKING 10 TARGETS!" appears
for five seconds. To acquire another target, terminate tracking of an unnecessary target, as shown
in the paragraph 3.5.
3.4.1 Manual acquisition
When the automatic acquisition (AUTO ACQ. AREA) is set to on, up to five targets may be
acquired manually. If you attempt to acquire a sixth target, the alert message appears.
1. Place the cursor on the target to acquire.
2. Press the ENTER key twice.
The plot symbol changes over time as below. A vector appears about one minute after acquisition,
indicating the target's motion trend. The target number is the youngest empty number.
ARP target mark
3.4.2 Automatic acquisition
The ARP can acquire up to ten targets automatically by setting an automatic acquisition area.
When automatic acquisition is selected after acquiring targets manually, only the remaining
capacity for targets may be automatically acquired. For example, if seven targets have been man-
ually acquired, three targets may be automatically acquired.
The automatic acquisition area is 2.0 to 2.5 miles in range and ±45° on either side of the heading
line in bearing. Targets being tracked in automatic acquisition are continuously tracked when
switching to manual acquisition.
Automatic acquisition area
1. Press the MENU key to show the main menu.
2. Choose ARP and press the ENTER key
3. Choose Auto Acquire and press the ENTER key.
At acquisition
1 min. after
acquisition
3 min. after
acquisition
01
01
Target numbe
r
01
Vector
Automatic acquisition area
45° port
45° starboard
2.0 - 2.5 nm
Off
On