Auto Meter 5881 Phantom GPS Speedometer Traditional incandescent lighting illuminates around the perimeter of the dial Display features: Time/Date, Cumulative Distance (odometer), Trip Distance (tripmeter), GPS Coordinates with Heading Info, Compass, and Peak Speed Recall These highly accurate GPS Speedometers include an omnidirectional 10 Hz antenna (10 samples per second) with a 16ft. cable, which is required for operation. The dimensions for the antenna are quite small (1.472 in. x 1.339 in. x 0.508 in.) allowing it to be easily hidden. The GPS antenna utilizes up to 3 GPS satellites simultaneously and samples 10 times per second Utilizes up to 3 GPS satellites simultaneously and samples 10 times per second Plug and Play, no calibration required!