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Speedometer for Boat

Create a Boat Speedometer in your browser, free and instantly.

km/h mph m/s knots
AnalogDigital
0 km/h
0
km/h
0
Top speed
0
Average
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GPS accuracy
Your GPS data is processed only on your device and is never uploaded or stored. For accurate readings, allow location access and use it outdoors on a phone.

Speedometer for every vehicle

Same GPS engine, tuned for what you're moving in — with the right units and dial range for each.

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A GPS speedometer for boats

A GPS speedometer for boats that shows your speed over the ground in knots by default, and also in km/h or mph. The dial is scaled to 60 knots to suit most leisure and motor boats, and it logs your top and average speed. A simple GPS speed log for boating and sailing. Everything runs on your device; nothing is uploaded.

How Boat Speedometer works

Knots and speed over ground

One knot is one nautical mile per hour, which is exactly 1.852 km/h. GPS gives you speed over ground (SOG) — your true speed relative to the seabed — which differs from speed through the water when there is a current or tide. For navigation, SOG is usually what you want.

Tips on the water

  1. Keep the phone where it has a clear view of the sky.
  2. Start tracking before you set off and allow location access.
  3. Protect the phone from spray; a waterproof case helps.

Want distance run? Use the GPS odometer (it shows distance in km or miles).

Common uses

  • See boat speed in knots
  • Show speed over ground (SOG)
  • Switch between knots, km/h and mph
  • Log your top speed on the water
  • Track average speed for a trip
  • Use for sailing or motor boating
  • Large digital knots display
  • Check speed without a marine instrument

Frequently asked questions

What is a knot?
One nautical mile per hour — exactly 1.852 km/h. The boat dial defaults to knots.
Is this speed over ground or through water?
GPS gives speed over ground (SOG); it differs from speed through water when there is a current.
How accurate is it?
With a clear GPS fix it is accurate to within about a knot.
Does it work offshore without signal?
GPS does not need a phone signal, but keep the device dry and with a clear view of the sky.
Is my position uploaded?
No — it stays on your device.
Is it free?
Yes, completely free.