Chart Navigation & Plotting · Dead Reckoning
In maintaining a DR plot, which of the following requires a new DR position to be plotted?
- AEvery time the engine RPM is logged
- BAt every change of course or speed, and at every fix✓ Correct
- COnly once per watch
- DOnly when entering soundings
Explanation
A DR position is plotted at every course change, every speed change, at each fix or running fix, and on the hour. This is the standard set of rules for maintaining a dead-reckoning plot.
Authority: Bowditch, American Practical Navigator (Pub. 9), DR principles
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