USCG Exam PracticeEstimated position from current set & drift
What is dead reckoning (DR), as used in marine navigation?
- A. Determining position by the intersection of two or more simultaneous lines of position
- B. Determining position by advancing a prior LOP along the DR track to the time of a second observation
- ✓ Determining position by applying course steered and distance run from a known starting pointCorrect
- D. Determining position using the vector sum of course made good and the current vector
Why C is correct
Bowditch Ch. 1 §102 defines DR 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 without external fix confirmation.
Cited:Bowditch Ch. 1 §102