![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgVLfc9PraiPCIDRiErG7cCDP9HUgnQGs36hpY-eFDmzgTstmyp3gMJYHNkAEswPw0oSNrEo4oinj88HlBtdEWUa9sRoLHckFi-omljYjL1e3RGsJ56XpT_2VQEvJteDTNkqlQCZQ0wBmml/s280/traverse-board.jpg)
During each standard four-hour watch, the crew measured the ship’s speed and direction eight times, every half hour, and recorded them using pegs: direction under the appropriate compass point on the rounded top; speed along the bottom. After each watch, the navigator collected the data, logged it, plotted it on a chart, cleared the board, and then began the process again.The boards were widely used throughout Europe and Scandinavia from the late 15th century until the mid-19th century. More information at Hakai Magazine.
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