Chart Navigation & Plotting · Speed-Time-Distance — Six-Minute Rule
Using the six-minute rule, how far does a vessel travel in 6 minutes at 18 knots?
- A3.0 NM
- B0.18 NM
- C1.8 NM✓ Correct
- D108 NM
Explanation
The six-minute rule: distance run in 6 minutes (one-tenth of an hour) equals speed in knots ÷ 10. At 18 knots the vessel covers 1.8 NM in 6 minutes.
Authority: Bowditch (Pub. No. 9), Speed-Time-Distance
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