4. AIS OPERATION
4-7
4.11 History Display (target past position)
This radar can display time-spaced dots (maximum ten dots) marking the past positions of any
AIS target being tracked. You can evaluate a target's actions by the spacing between dots. Below
are examples of dot spacing and target movement.
Target movement and history display
You may choose the number of history dots to display and the time interval to display them.
1. Press the MENU key to open the menu.
2. Choose Target and press the ENTER key.
3. Choose History Dots and press the ENTER key.
4. Choose number of history dots to display (5 or 10) or choose Off to turn off the history display.
5. Press the ENTER key.
6. Choose History Intervals and press the ENTER key.
7. Choose appropriate time interval and press the ENTER key.
8. Press the MENU key to close the menu.
(a) Ship turning
(b) Ship running
straight
(c) Ship reduced
speed
(d) Ship increased
speed
Off
5
10
15sec
30sec
1min
2min
3min
6min
12min
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