Marine speed is often discussed in knots, while road speed is often MPH or KM/H. A useful GPS speedometer app should make switching units easy and keep the display readable outdoors.
Why knots matter
Knots are commonly used for boats and marine conditions. ClearSpeed GPS includes knots as a built-in unit, alongside MPH and KM/H, so the same app can be useful on roads and on water.
What ClearSpeed GPS can show
- Current GPS speed in knots, MPH, or KM/H.
- Trip distance.
- Elapsed time.
- Max speed and average speed.
- GPS signal status.
GPS signal still matters
GPS performance depends on device placement, signal quality, sky visibility, movement, and environmental conditions. Keep the phone secure and use the signal indicator before trusting the displayed number.
Not a navigation or safety system
ClearSpeed GPS is a speed display. It is not a chartplotter, navigation system, emergency device, or certified marine instrument. Use appropriate marine equipment and follow local rules.
Simple speed in knots
ClearSpeed GPS is useful when you want a clean iPhone GPS speed readout in knots without subscriptions, accounts, ads, or tracking.
Related: choosing MPH, KM/H, or knots and how GPS speedometers work.