Navigation General · Dead Reckoning
A vessel departs a known position at 0800 on course 090°T at 12 knots. What is the DR position at 1100?
- A36 nautical miles east of the departure point✓ Correct
- B24 nautical miles east of the departure point
- C48 nautical miles east of the departure point
- D36 nautical miles west of the departure point
Explanation
Time elapsed = 1100 - 0800 = 3 hours. Distance = Speed × Time = 12 × 3 = 36 nm. Course 090°T is due east, so the DR position is 36 nm east of departure.
Authority: Bowditch (Pub. 9), Ch. 7
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