Chart Navigation & Plotting · Dead Reckoning
A dead-reckoning (DR) position is determined from:
- AA single bearing to a known object
- BCourse steered and distance run from the last known position, without current or wind✓ Correct
- CA celestial observation
- DThe depth sounder reading
Explanation
A DR is projected from the last fix using only course steered and distance run (speed × time). It deliberately ignores set, drift, and leeway; when those are accounted for, the result is an estimated position, not a DR.
Authority: Bowditch, Pub. No. 9 (dead reckoning)
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