Traverse board

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(Naut.) a small board hung in the steerage, having the points of the compass marked on it, and for each point as many holes as there are half hours in a watch. It is used for recording the courses made by the ship in each half hour, by putting a peg in the corresponding hole.

See also: Traverse

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
Since most crewmembers in the early days of exploration were illiterate, a short lesson was given on how to use a traverse board to record speeds and distances.