Sperry Marine Visionmaster FT ECDIS User Manual page 280

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When a MOB event has been activated, the Man Overboard window
displays the following read-only data:
•
Bearing (R) - the relative bearing from
CCRP to MOB event.
•
Bearing (T) - the true bearing from
CCRP to MOB event.
•
Range (nm) - the distance from
CCRP to MOB event.
•
Elapsed Time - time since the MOB
event started.
•
Latitude / Longitude - values from
CCRP to MOB event based on Set
and Drift values.
When an MOB operation is active the button
at the bottom of the window displays Cancel MOB.
If MOB event is being activated based on suspicion that a person has gone
overboard sometime in the past the operator may manually adjust the
elapsed time value accordingly by clicking the Manual Edit button. If you
manually edit the Elapsed Time value only, the MOB symbol is
automatically placed at a position based on ownship history data, with an
adjustment based on Set and Drift that was in effect at the manually
specified time. Bearing, range, latitude & longitude values will automatically
update to reflect the new location, which will be along the own ship history
track - offset from the track based on the applied Set and Drift.
The figure below shows the calculation of Oscar position for a MOB event
that occurred in the past along ship's track.
CCRP location at
elapsed time specified
5-54
Initial MOB position at the
time MOB event is activated
MOB
Initial estimated Set & Drift
experienced by MOB event
ECDIS User Guide
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