USCG Exam PracticeEstimated position from current set & drift
According to standard DR plotting practice, when must a new DR position be plotted?
- A. Only at each fix and at every course change
- ✓ At every course change, every speed change, at each fix, and at least once each hourCorrect
- C. At every speed change and at least once every two hours
- D. Only when the vessel enters pilot waters
Why B is correct
Bowditch Ch. 8 §801 states that a new DR position is plotted at every course change, at every speed change, at the time of each fix, and at least once each hour — more often in pilot waters. No single trigger alone is sufficient.
Cited:Bowditch Ch. 8 §801