Garmin GA 38 GPS-GLONASS Antenna. This GPS antenna by Garmin is built to take advantage of the GLONASS system/constellation of satellites as well as standard GPS. The Garmin G.A. 38 Antenna is a robust external antenna that is packaged in a low-profile waterproof housing and provides 3 easy mounting solutions: pole surface or under-deck (for the underside of fiberglass decks). The Garmin GA External GPS/GLONASS Waterproof Antenna provides increased flexibility and installation options as well as the potential for enhanced reception of GPS/GLONASS signal for those products with built-in GPS/GLONASS antennas. Features of Garmin GA 38 GPS-GLONASS Antenna: GPS/GLONASS enabled IPX7 waterproof Terminated with a BNC Package Contents: Garmin GA 38 GPS-GLONASS Antenna GA 38 GPS/GLONASS Antenna Documentation Garmin 010-12017-00: GA 38 GPS-GLONASS Antenna