Sperry Marine Visionmaster FT ECDIS, Руководство пользователя

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Targets ECDIS User Guide
10-26 65900012
Past Position Dots
When past position dots are switched on, dots
are displayed on the screen indicating the past
positions of all targets (with the exception of
sleeping AIS targets).
As soon as a tracked target is acquired, or when an AIS target is activated,
the past position data starts to build up. The number of dots displayed, up
to a maximum of 4, is determined by the length of time the target has been
tracked and the time interval selected.
Past position dots are available in all presentation and motion modes
providing the system has a working compass.
To turn past position dots on tick the Display Past Positions check box.
A thin dotted line connecting the target and its associated dots may be
selected to be drawn. To turn the line on or off tick the
Connecting Line
check box.
To select the past position time interval do the following:
1. With the Past Position check box enabled click on the drop down
arrow next to the interval time. The intervals are displayed ranging
from 15 seconds to 16 minutes.
2. Select the time interval from the drop
down list (the default time is 1 minute).
The system changes to displaying the
position dots in the selected time interval.