Davis Instruments Corp. Pelorus for True Course Setting and Compass Correction. "The Davis Compass Corrector and Pelorus is a sophisticated navigational instrument. With it the navigator can accurately perform all the basic tasks of coastal navigation-fixing his position, determining his course and bearing, and finding speed and distance offshore. As well, the instrument is basic to compass correction-determining the allowance to make for compass deviation and actually adjusting for it." Comes with its plastic cover/carrying case. Has two screws for attaching to boat. Being sold "As is", no knowledge of its working ability.

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