Chart Navigation & Plotting · Speed-Time-Distance
A vessel must cover 45 nautical miles to make an appointment in 3 hours. The required speed of advance is:
- A12 knots
- B18 knots
- C15 knots✓ Correct
- D13.5 knots
Explanation
Speed = Distance ÷ Time = 45 nm ÷ 3 h = 15 knots.
Authority: Bowditch, American Practical Navigator (Pub. No. 9)
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