Chart Navigation & Plotting · Dead Reckoning
A DR position is best described as a position determined by:
- ATwo or more simultaneous lines of position
- BA celestial observation reduced to a fix
- CApplying course and speed (distance) to a known earlier position, without allowance for current or leeway✓ Correct
- DGPS only
Explanation
Dead reckoning advances a known position by course steered and distance run through the water, with no correction for set, drift, or leeway. Adding those corrections produces an estimated position, not a DR position.
Authority: Bowditch, American Practical Navigator (Pub. 9), DR principles
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