Chart Navigation & Plotting · Dead Reckoning
Standard practice is to plot a DR position at least:
- AOnce per watch only
- BOnly when leaving and entering port
- CEvery hour, at every course or speed change, and at every fix✓ Correct
- DEvery six minutes
Explanation
The DR is advanced every hour on the hour, at each change of course or speed, when a fix or running fix is obtained, and when a single LOP is obtained. Keeping the DR current is what lets you anticipate dangers and check fixes for blunders.
Authority: Bowditch, Pub. No. 9 (DR plotting rules)
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