Chart Navigation & Plotting · Set & Drift — Estimated Position
An estimated position (EP) differs from a dead-reckoning (DR) position in that the EP also accounts for:
- AThe effects of current (set/drift) and/or leeway✓ Correct
- BOnly the course steered
- COnly the speed log
- DThe compass deviation alone
Explanation
A DR position is advanced using only course steered and speed/distance through the water. An EP applies the estimated current (set and drift) and leeway to the DR, giving a best estimate of actual position absent a fix.
Authority: Bowditch (Pub. No. 9); Dutton's Nautical Navigation
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