This listing is for two marine navigation books. Volume two is for latitudes 15 to 30°. Volume 3 is for latitudes 30° to 45°. They were created by the defense mapping agency hydrographic topographic center.

Volume two has a Copyright date 1994 by the US government.

Volume three is a little bit older, with a copyright date of 1974.

According to the preface these books are designed to facilitate the practice of celestial navigation at sea by the Marcq Saint Hilaire or intercept method.

These books are in good condition for their age. They have very minor bumps or marks on the cover. The older book has pages that are slightly yellowed with age. The gold gilt lettering on the cover of the older book is not as bright as the gold on the newer book.

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