USCG Exam PracticeDead reckoning — DR plot maintenance
A new DR position must be plotted at every course change, every speed change, at each fix, and ______.
- A. at least once each watch, more often offshore
- B. every 30 minutes regardless of waters
- C. at least once each hour, less often in pilot waters
- ✓ at least once each hour, more often in pilot watersCorrect
Why D is correct
Bowditch Ch. 8 §801 specifies the DR position must be updated at least once each hour and more often in pilot waters, not less often.
Cited:Bowditch Ch. 8 §801