Traverse board

Traverse board

could use the traverse board.

The traverse board is a simple wooden board with peg-holes and attached pegs. It is divided into two parts.

The top part is for recording direction sailed. It has a representation of the compass rose with its 32 compass points, just as it would have been shown on the face of the ship's compass. Eight concentric rings are inscribed on the compass rose, each with one peg hole at each point of the compass. Eight pegs are attached to the center of the compass rose with strings.

The bottom part is for recording speed. It has 4 rows of holes. Each column represents a certain speed, measured in knots. Eight pegs are attached to this part of the board.

Each half-hour during the watch, a crew member would insert a peg in the top portion of the board to represent the heading sailed during that half-hour, just as it is shown on the ship's compass. The innermost ring of peg-holes is used for the first half-hour, the second for the second half-hour, and so on until all 8 rings were use.

Each hour during the watch, a crew member would insert a peg in the bottom portion of the board to represent the speed sailed during the hour. The speed would have been measured using a knot log. If the speed for the first hour of the watch were 10 1/2 knots, the crew member would count over 10 holes in the first row and place one peg, then place another peg in the column marked "1/2". In the second hour of the watch, the crew member would use the second row of pegs, and so on until all 4 rows were used.

At the end of the watch, the navigator would collect the information about the speeds and directions sailed during the watch, clear the pegs from the board, and use the information to figure the vessel's dead reckoning track. Meanwhile, the helm of the new watch would begin recording the new sailing headings and speeds on the traverse board.

External links

* [http://www.rootsweb.com/~mosmd/travbrd.htm The Pilgrims & Plymouth Colony:1620 -- Navigation: The Traverse Board] by Duane A. Cline -- line drawing of traverse board


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  • traverse board — noun : a navigation device consisting of a small board marked with the four points of the compass with eight holes bored at each point to represent each half hour in a watch and used to peg the courses made by a ship in each half hour …   Useful english dictionary

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  • Traverse — Trav erse, v. t. [imp. & p. p. {Traversed}; p. pr. & vb. n. {Traversing}.] [Cf. F. traverser. See {Traverse}, a.] 1. To lay in a cross direction; to cross. [1913 Webster] The parts should be often traversed, or crossed, by the flowing of the… …   The Collaborative International Dictionary of English

  • To solve a traverse — Traverse Trav erse, n. [F. traverse. See {Traverse}, a.] 1. Anything that traverses, or crosses. Specifically: [1913 Webster] (a) Something that thwarts, crosses, or obstructs; a cross accident; as, he would have succeeded, had it not been for… …   The Collaborative International Dictionary of English

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