Northrop Grumman Sperry Marine VisionMaster FT, User Manual

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Radar/Chart Radar User Guide Navigation Tools
65900010 6-65
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 Oscar.

Bearing (T) - the true bearing from CCRP
to Oscar.

Range (nm) - the distance from CCRP to
Oscar.

Elapsed Time - time since the MOB event started.
When an MOB operation is active the button at the bottom of the window
displays
Cancel Oscar .
If the MOB event is being activated based on the suspicion that a person
has gone overboard sometime in the past the operator may manually
adjust the elapsed time value accordingly by clicking on the
Manual Edit
button. If you manually edit the Elapsed Time value only, then Oscar is
automatically placed at a position based on own ship history data, with an
adjustment based on the Set and Drift value that was in effect at the
manually specified time. The bearing and range 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.