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Details and Image

TypeModel No.MakerCountryConstruction
DateScale LengthArea of Use
Coasting Computer & Cross Drift Detector
American Hydromath Company for the U.S. Maritime CommissionUSA
c. 1944Dia. = 15.2 cmNautical

Notes: Used to calculate a course correction to account for a cross drift - sort of equivalent to the E6-B calculatior that aircraft pilots used.

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