Chart Navigation & Plotting · Dead Reckoning
An estimated position (EP) differs from a DR position because the EP includes:
- AA correction for the best available estimate of current and/or leeway✓ Correct
- BOnly the compass deviation
- CA second fix
- DA correction for index error
Explanation
An EP is the DR position adjusted by the navigator's best estimate of the effect of current, set/drift, and leeway. It is more probable than a bare DR but less certain than a fix.
Authority: Bowditch, American Practical Navigator (Pub. 9)
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