The traverse board was used to make dead reckoning. The circular part has 32 compass points with eight holes on each point. In the middle are eight cords secured with little pins. The pins are made of copper. The cardinal regions are marked N, NO, O, SO, S, SV, W, NV. The incorrectly indicated SV was later corrected. During the watch at sea, the sailed course was recorded every half hour by placing a pin on the sailed course
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