Building a Shadow Pelorus and Compensating Compass


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Compass compensating aboard a boat is performed by running reciprocal courses. With the compass on a book that was rotated 180 degrees on the table, you were, in effect, running reciprocal courses indoors. To run a reciprocal course on the water, you reverse your boat’s heading by 180 degrees so that if you were originally heading north, your reciprocal course will be south. Here's how to use a home-made Shadow Pelorus to help you do this accurately.

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