Join Date: Jun 2006
Location: Melbourne, Australia
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I can think of 2 situations where you need to know reciprocals.
Firstly, lead markers are often marked on a chart with the bearing to run in on but that bearing is no good if you're outbound - to safely steer the course outbound you would steer the reciprocal of what is on the chart.
Secondly, to use your example, when you take the bearings, they are bearings from YOU to the object. If you needed to give someone your position using an object as the reference, you would say you are 120 FROM the lighthouse at a range of , say, 2 miles, or 060 FROM the church at a range of 2 miles.
BTW, it is convention for bearings to be represented by 3 numbers. For example, 60 should be represented as 060. Also, just to clarify, taking a fix on 2 points will not give you an accurate position; always use a minimum of 3 bearings . . . I'm sure you knew that already :-)
(No worries mate!)
Western Port Marina
Hastings, Vic, Australia