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7. AIS OPERATION
38
7.8 History Display
The history display shows equally time-spaced dots marking past positions of
activated targets being tracked. A new dot is added at preset time intervals until
the preset number is reached. If a target changes its speed, the spacing will be
uneven. If it changes course, its plotted course will not be a straight line.
Below are sample history displays.
(a) Ship turning
(b) Ship running
straight
(c) Ship reduced
speed
(d) Ship increased
speed
Sample history displays
7.8.1 Turning history display on/off
1. Press the [AIS MENU] key to open the AIS menu.
2. Press the [0] key to show the AIS2 menu.
[AIS(2)]
1 [AIS(1)]
2 HISTORY
OFF/ON
3 HISTORY POINTS
5/10
4 HISTORY INTERVAL
10/30SEC/1/2/3/6MIN
5 HISTORY COLOR
RED/MAGENTA/YEL*/
GRN*/CYAN/BLU/WHITE*
6 SYMBOL COLOR
RED/MAGENTA/YEL*/
GRN*/CYAN/BLU/WHITE*
7 ROT TAG
000.0 /MIN
8 AUTO ACTIVATE
OFF/ON
RANGE 000.0NM
9 LOST TARGET RANGE
000.0NM
0 [(AIS(3)]
* = Not available on
IMO type.
AIS2 menu
3. Press the [2] key (HISTORY).
4. Further press the [2] key to turn the history display on or off as appropriate.
5. Press the [ENTER] key.
6. Press any menu key to close the menu.