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-2.6-
3. Press the PLOT MENU key and [6] key followed by the ENTER key.
The reference target mark (see below) appears at the cursor position and the own ship data
label changes from "LOG," "NAV" or "MENU" to "REF." Note that it takes 60 scans or
approximately 1 min before a new speed is displayed. If tracking has failed for a reference
target, the target is marked with a lost target mark (symbol formed with two triangles).
R
changes to ○
○○
○R in 60 scans
Notes:
1) When the reference target is lost or goes out of the acquisition range, the reference target
mark blinks and the speed reads "xx.x." Select a different reference target in this case.
2) When all targets are deleted, the reference target mark is also deleted and the target-based
speed becomes invalid. The speed is indicated in KTBT where BT means Bottom Track
(speed over ground).
3) The vector of the reference target can be displayed by menu operation (ARPA 1 menu).
Canceling target-based speed
To cancel the target-based speed, the PLOT MENU and [6] key. The speed is shown by LOG,
NAV* or MANUAL as selected previously.
Deactivating the ARPA
To deactivate the ARPA, press the RADAR MENU key and [8] key twice followed by the
ENTER key. Target plotting symbols and the on-screen label ARPA will disappear. The label
EPA appears.
2.5 Automatic Acquisition
The ARPA can acquire up to 30 targets (20 automatically and 10 manually or all 30 manually).
If AUTO ACQ is selected after more than 20 targets have been manually acquired, only the
remaining capacity of targets can be automatically acquired. For example, when 30 targets
have been acquired manually, then the ARPA is switched to AUTO ACQ. Only 10 targets can
be acquired automatically.
A target just acquired automatically is marked with a broken square and a vector appears
within 20 scans of antenna to indicate the target's motion trend. Within 60 scans, the initial
tracking stage is finished and the target becomes ready for stable tracking. At this point, the
broken square mark changes to a solid circle. (Targets automatically acquired are
distinguished from those acquired manually, the targets which are acquired manually are
displayed by bold symbol.)