OtoZen calculates speed using your phone’s GPS data, while your car’s speedometer uses the vehicle’s internal system.

Because of this, small differences between the two readings are normal.

GPS speed may be less accurate in areas with weak or blocked signals, such as:

• Tunnels
• Areas with tall buildings
• Heavy tree cover
• Poor network or GPS conditions

In most cases, the speed shown in OtoZen is highly accurate and should closely match your car’s speedometer.