Sierra 781-683-060P Arctic Series Speedometer Features Dial Range 0-60 MPH Included LCD heading display to show course over ground 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 Scratch-resistant domed glass lens Enhanced illumination through-dial and perimeter lighting for