Definition
The fundamental input to dead reckoning, where the DR position is found by laying off the course steered from the last known position for the distance shown by the log. If no log is available it is computed as speed multiplied by time, for instance 5.5 knots for 40 minutes giving 5.5 times 40 divided by 60, that is 3.67 nautical miles. Recording it in the deck log at every fix and course change is essential practice.
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