The Speed Displayed on My Automotive Device Differs From the Speedometer in My Vehicle

The speedometer on your device may display a different speed than the speedometer in your vehicle.

While the speedometer in a vehicle is based on calculations using tire rotation, GPS devices calculate speed based on your GPS position. The accuracy of the speed displayed on the vehicle and GPS device can vary, depending upon whether the vehicle's speedometer needs to be calibrated and/or how accurate your GPS reception is.

Important: GPS devices should be used as a navigational aid and should not be relied upon for precise measurement of speed.