Approximate conversion factors

• Current speeds: 10–50 cm/s = 0.2–1 knots = 0.36–1.8 km/h = 0.22–1.1 mph
• Depths: 10–100–1000 m = 30–300–3000 feet = 5–50–500 fathoms
• Distances: 100 km = 62 miles = 54 nautical miles (NM)
• Pressure: 1000 mbar = 14.5 psi = 29.5 inches mercury
• Temperatures: 5–15–25 ° Celsius = 41–59–77 ° Farenheit
• Wave heights: 0.3–1–3–10 m = 1–3–10–30 feet
• Wind speeds: 5–10 m/s = 10–20 knots = 18–36 km/h = 11–22 mph