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Reciprocal Course

When returning on a known course heading it is a simple matter to compute the reciprocal course heading. If the original course was less than 180 degrees we add 180 and if the original course was more that 180 degrees we subtract 180 degrees. If you draw your course line through the center of the compass rose you can determine your reciprocal heading that way. Finally, using the Charting Pal you can easily place it on the other end of your course leg and read the reciprocal course on the outer ring.