Displaying Ais Target Past Positions; Displaying And Erasing Past Position Points, Choosing Past Position Interval - Furuno FCR-2107 Series Operator's Manual

5. AIS Operation
5.12

Displaying AIS Target Past Positions

The past position display shows equally time-spaced dots marking past positions of activated AIS targets. 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 past position displays.
(a) Ship turning (b) Ship running
5.12.1 Displaying and erasing past position points, choosing past position
interval
1. Use the trackball to select the Past Posn indication at the right side of the screen.
AUTO
MAN
xx.xx xx.xx
Past Posn indication
2. Do one of the following to select a vector time.
Control
Scrollwheel 1, 2, 3, 5, 6, 10, 12, 15, 20, 30, 40, 50, 60 min
3. Push the left button to confirm selection.
5-16
(c) Ship reduced
straight
speed
Sample past position displays
Available setting
(d) Ship increased
speed