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2. RADAR OPERATION
2-31
2.26.6 Displaying past position (ARP)
This ARP can display time-spaced dots (maximum ten dots) marking the past positions of
any targets being tracked. You can evaluate a target’s actions by the spacing between dots.
Below are examples of dot spacing and target movement.
(a)Shipturning
(b)Shiprunning
straight
(c)Shipreduced
speed
(d)Shipincreased
speed
Past position displays
To turn the past position display on or off:
1. Press the MENU key followed by the ARP SETUP soft key.
2. Operate the Trackball to select HISTORY INTERVAL.
3. Press the EDIT soft key to show the history interval window.
HISTORY INTERVAL
▲
▼
OFF
30 seconds
1 minute
3 minutes
6 minutes
History interval window
4. Operate the Trackball to select history interval among 30 sec, 1 min, 3 min and 6 min,
or select OFF to turn off the past position display.
5. Press the ENTER soft key.
6. Press the MENU key to close the menu.
2.26.7 ARP, TTM target data
You can show motion trends (range, bearing, course, speed, CPA and TCPA) for ARP or
TTM targets. Note that TARGET ID NUMBER, in the ARP SETUP menu, must be turned on
to display this data.
1. Place the cursor on the target whose data you want to see.
2. If not already displayed, press the HIDE/SHOW key to show the radar soft keys.
3. Press the TARGET and TARGET INFO soft keys. The data of the selected target
appears at the bottom left-hand corner of the display. (If an EBL/VRM data box is
displayed the ARP (TTM) data box will be under it.)
4. Press the RETURN soft key to finish.
To erase ARP/TTM target data, select the corresponding target with the cursor, then press
the CLEAR key.