A GPS speedometer for a truck
A GPS speedometer for trucks and lorries, with the dial scaled to 160 km/h (100 mph) to match commercial road speeds. It shows your real ground speed in km/h or mph with top and average speed — useful as a backup gauge or to check the cab speedometer against your true speed. Everything runs on your device; nothing is uploaded.
How Truck Speedometer works
Why check truck speed with GPS
Like other vehicles, a truck's speedometer is set to read slightly high so it never under-reports. GPS measures your true distance over the ground, so it is a good independent check — handy where speed limiters and tachographs matter. Large vehicles often have legal speed limits below the dial maximum, so the readout helps you stay compliant.
Tips
- Mount the phone in the cab or let a co-driver watch it — never tap it while driving.
- Start tracking before setting off and allow location access.
- Allow a few seconds for a solid GPS fix.
See also the car speedometer and the GPS odometer.
Common uses
- Backup truck speedometer
- Check the cab gauge accuracy
- See true speed in km/h or mph
- Stay within a speed limiter
- Log top speed on a route
- Track average speed on a haul
- Large digital speed display
- Compare GPS and dash speed
Frequently asked questions
Is a GPS truck speedometer accurate?
Yes — with a clear outdoor fix it is usually within a few km/h of your true speed.
Why is it lower than my cab speedometer?
Vehicle gauges read slightly high by law; GPS shows true ground speed.
Can it record top speed?
Yes — it keeps your top and average speed for the trip.
Does it need mobile data?
No — once the page is loaded, GPS works without a data connection.
Is my location stored?
No — it is processed only on your device.
Is it free?
Yes, completely free.