USCG Exam PracticeEstimated position from current set & drift
At a minimum, how often must a new DR position be plotted when no course or speed change occurs and no fix is obtained?
- A. Every 30 minutes
- B. Every two hours
- ✓ At least once each hourCorrect
- D. Only when a fix is obtained
Why C is correct
Bowditch Ch. 8 §801 requires a new DR position at every course change, speed change, and fix, and at least once each hour — more frequently in pilot waters. Waiting two hours or only plotting at fixes would leave the plot dangerously out of date.
Cited:Bowditch Ch. 8 §801