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-2.6-
2.4.2 Manual speed input
Select MAN at step 2 in preceeding procedure, press the [3] key twice, and enter a speed with
numeral keypads.
Target-based speed input
This mode is used when the ship’s SDME (log) is not operating properly or the vessel has no
device which detects ship’s leeward movement (Doppler sonar 2-axis speed log, etc.) and leeward
movement is not disregarded.
If you select target-based speed, the radar calculates own ship's speed relative to fixed reference
targets. The number of targets may be 1, 2 or 3. They appear as tracked targets, each shown in a
small circle, but without a vector. When a plural of reference targets are selected, the mean value
is used for stabilization and speed. A vector can be displayed for the reference target. This can be
done with REF TGT VECTOR on the PLOT menu 2.
1. Select a small ground mass target (small island, lighthouse) 0.2 to 24
nautical miles from own ship.
2. Place the cursor on the target.
3. Press [MENU], [7], [7], [0], [0], [9], [9].
4. Press the [MENU] 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 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).
changes to R in 60 scans
Reference targets are marked with a circle having a reference number
(R1, R2, R3).
Note: Targets under automatic tracking condition should not be
selected as reference Targets.
PLOT MENU 2
1. ↑
2. AUTO ACQ
OFF ON SET
3. GUARD ZONE
OFF ON SET
4. TRACK TEST
OFF ON
5. LAND
DISCRIM
0 1 2 3 4
6. TTM
OFF
REL TRUE
7. VECT START
1min
20SCAN
8. REF TGT
VECTOR
OFF ON
9. TARGET
BASED SPEED
2.5 Acquiring Targets
The ATA permits automatic acquisition (10 targets) plus manual acquisition (10 targets), or fully
manual acquisition (20 targets) within a range of 0.2 to 32 miles. The targets are automatically
numbered and the same numbers are not used more than once until the maximum capacity is
reached.
Before starting the ATA, check that heading and speed readouts at the top of the screen are
correct.
2.5.1 Manual acquisition
1. Place the cursor (+) on a target of interest by operating the trackball.
2. Press the [PLOT SYMBOL] key.