USCG Exam PracticeEstimated position from current set & drift
According to standard DR plotting practice, at 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 states that a DR position must be plotted at every course change, every speed change, at the time of each fix, and at least once each hour — more often in pilot waters.
Cited:Bowditch Ch. 8 §801