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4. AIS OPERATION
4-7
4.11 History Display (target past position)
This radar can display time-spaced dots (maximum ten dots) that marks the past po-
sitions of any tracked AIS target. You can evaluate actions of a target by the spaces
between the dots. Below are examples of dot spacing and target movement.
You can select the number of history dots to display and the time interval to display
the history dots.
1. Press the MENU key to open the menu.
2. Use S or T to select [Target] and press the ENTER key.
3. Use S or T to select [History Dots] and press the ENTER key.
History Dots options
4. Use S or T to select number of history dots to display (5 or 10) or select [Off] to
turn off the history display.
5. Press the ENTER key.
6. Use S or T to select [History Interval] and press the ENTER key.
History Interval options
7. Use S or T to select 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
10
5
15s
30s
2min
3min
6min
12min
1min