Definition
Pressing the man overboard key on a GNSS receiver, plotter or DSC radio instantly saves the current position as a waypoint and switches the display to bearing, range and often a return course to it. Because the casualty drifts with tidal stream and wind while the boat manoeuvres, the mark is a datum for the start of the search, not the person's present position, and a dedicated lookout must still be posted.
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