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 spacing
between dots. Below are examples of dot spacing and target movement.
Target movement and history display
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 the Cursorpad (S or T) to select [Target] and press the ENTER key.
3. Use the Cursorpad (S or T) to select [History Dots] and press the ENTER key.
History Dots options
4. Use the Cursorpad (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 the Cursorpad (S or T) to select [History Interval] and press the ENTER key.
History Interval options
7. Use the Cursorpad (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
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