The sixth edition follows faithfully in the tradition of its
honored predecessors which, over a period of more than forty years,
have provided exactly what is needed for beginning navigators to
learn the subject on their own. It explains what is being done and
why, without getting into mathematics beyond adding and
subtracting, and occasional multiplying and dividing. The method
taught is H.O. 249 because it is simple, inexpensive, and accurate
enough for use even by experts.
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