Humminbird External GPS Antenna

Precision NMEAO 183 GPS WAAS receiver provides fast position fixes accurate within 2.5 meters. Provides fast position fixes accurate within 2.5 meters. Provides more accurate position fixes than the industry standard GPS Dimensions are 3-1/4' diameter 1-1 1/2" high and comes with 20' cable and has a 1"-14 thread count stem mountable with an optional antenna stem( antenna stem not included). Software must be 6.300 or higher for the humminbird system to be compatible with the AS GRP GPS Compatible with SOLIX series AS GPS NMEA cable required to connect external GPS module. Compatible with HELIX 15, 12, 10, 9 ,8 ,7 G2N/G3N/G4N.