Veratron Professional 85MM (3-3/8") Rudder Angle Indicator f/NMEA 0183 [B00067401]Professional 85MM (3 3 8") Rudder Angle Indicator for NMEA 0183 Specially designed to fit into the standard 85mm panel cut, the Professional Rudder Angle Indicator is developed to suit commercial applications thanks to the embedded NMEA 0183 transceiver which makes it operable with most of the professional autopilots out in the field and the large 270 dial scale and Red illumination which makes it well readable and accurate in the indication. It