An under utilized technique for avoiding collisions is the use of magnetic bearings taken with a hand held magnetic compass.
First take and record an initial bearing of a crossing vessel then compare to a subsequent bearing six minutes or so later. If a bearing change is observed then under most circumstances a risk of collision does not exist. If there is no appreciable change in a subsequent bearing then assume that there is a risk of collision and follow the RULES OF THE ROAD accordingly. For the most current RULES OF THE ROAD go to :
http://www.navcen.uscg.gov/mwv/navrules/rotr_online.htm
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