Speedo GPS, Black Premier Pro, 0-80 MPH

Dial Range: 0-80 MPH Use our GPS antenna (sold sep) or connect to an existing NMEA 0183 GPS device - connectors included Speed accuracy of +/-1 MPH (once moving) Heading accuracy of +/-1 degree (once moving) Ideal for slow speed apps like pontoon boats and for high speed performance boats w/ pitot tubes