Chart Navigation & Plotting · Speed-Time-Distance
Using the three-minute rule, a vessel travels 600 yards in 3 minutes. Her speed is approximately:
- A6 knots✓ Correct
- B3 knots
- C12 knots
- D9 knots
Explanation
Under the three-minute rule, distance in yards in 3 minutes ÷ 100 = speed in knots. 600 / 100 = 6 knots.
Authority: Bowditch, American Practical Navigator (Pub. 9)
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