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Starboard reaching leg heading

The first reach is 135 degrees to port from the windward leg. You can just subtract 135 degrees from the windward heading. Personally, I find it easier to first add 45 to the windward heading, then find the reciprocal course (reciprocals are easy if you've been practicing!). 


Port reaching leg heading

Port is easier. Once you've found the starboard reach heading, the port heading is 90 degrees less.

Or calculate the leeward heading (reciprocal of the windward heading) and subtract 45 degrees.



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