GPS Speed Alert with GPS speedo,compass &clock HMSA3000
The GPS Speed Alert uses satellites to determine three-dimensional speed independently of the vehicle. No calibration is required for the unit to display correct speed in kilometres per hour or miles per hour. The user can choose between 3 displays to show speed only , speed and heading or speed heading , position and battery voltage . The unit contains an internal antenna and the only electrical connection required is via a cigarette lighter plug that can be used in 12V or 24V vehicles.