Basic Operation of ECDIS-E
ECDIS-E User Guide
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65934012
Motion Modes
The motion mode determines how the trails of moving targets are shown
across the screen relative to own ship and how chart information is
updated.
The only motion mode available to ECDIS-E is True
Motion (TM). The motion mode is displayed as an
abbreviation at the top right of the screen.
True Motion
In TM own ship moves across the screen by the system applying Latitude
and Longitude (L/L) positional updates to it. All stationary items (i.e. items
with constant L/L coordinates) remain in a fixed position on the screen and
all targets move according to their true course and speed.
When own ship reaches the edge of the TM limits box, and true motion
reset limits are enabled, it is repositioned to the edge of the box, such that
a line drawn from own ship's CCRP in the direction of the current course
passes through the centre of the box.
The TM Limits box default size is approximately 90% of the chart window
size (90% being the maximum size of the box). The box size can be
redrawn by the operator, see Setting True Motion Limits.
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