Chart Navigation & Plotting · Speed-Time-Distance — ETA with Current
You have 90 NM to run and your speed of advance (allowing for current) is 15 knots. Departing at 0800, your ETA is:
- A1430
- B1330
- C1400✓ Correct
- D1500
Explanation
Time = 90 ÷ 15 = 6.0 hours. 0800 + 6h00m = 1400. Using the speed of advance (made good over the ground) accounts for the current in the ETA.
Authority: Bowditch (Pub. No. 9), Speed-Time-Distance
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