Chart Navigation & Plotting · Set & Drift — Speed of Advance
You must cover 120 NM along your intended track and arrive in 10 hours. What speed of advance (SOA) must you plan for?
- A12 knots✓ Correct
- B10 knots
- C15 knots
- D20 knots
Explanation
Speed of advance is distance to be made good along the track divided by the time available: 120 NM ÷ 10 h = 12 knots. SOA accounts for the net progress required, independent of the speed through the water needed to overcome current.
Authority: Bowditch (Pub. No. 9), Speed of Advance
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