Travel time = Distance / Speed. In nautical terms, distance is measured in nautical miles and speed in knots (nautical miles per hour). A 25 nm trip at 18 knots takes 1 hour 23 minutes without accounting for current.
- 25 nm at 18 knots: 25 / 18 = 1.39 hours = 1 hour 23 minutes
- 50 nm at 20 knots: 50 / 20 = 2.5 hours = 2 hours 30 minutes
- Always add time for current effects: favorable current reduces time, adverse increases it
- Include waypoint stop time for fuel, fishing, or customs clearance
- 1 nautical mile = 1.15 statute miles = 1.852 kilometers
| Distance (nm) | Speed (kts) | Travel Time |
|---|---|---|
| 10 nm | 15 kts | 40 min |
| 25 nm | 18 kts | 1h 23m |
| 50 nm | 20 kts | 2h 30m |
| 100 nm | 25 kts | 4h 00m |