USCG Exam Practice · Estimated position from current set & drift
Dead reckoning (DR) is best described as which of the following?
- AA fix obtained by advancing a line of position along the DR track to a later observation
- BDetermining position by applying course steered and distance run from a known starting point✓ correct
- CThe vector sum of course steered and the current vector to obtain course made good
- DDetermining position using electronic navigational equipment cross-checked by celestial observation
Why B is correct
Bowditch Ch. 1 §102 defines dead reckoning as the determination of position by applying course steered and distance run from a known starting point, and notes that DR accuracy degrades over time and must be confirmed by external fixes.
Cited:Bowditch Ch. 1 §102
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