Garmin GA 38 GPS GLONASS Antenna - Black [010-13305-20]GA 38 GPS & GLONASS Antenna Black Built to take advantage of the GLONASS system constellation of satellites as well as standard GPS, this robust external antenna is packaged in a low profile water resistant housing and provides 3 easy mounting solutions: pole, surface, or under deck (for the underside of fiberglass decks). External GPS GLONASS antennas provide increased flexibility and installation options, as well as the potential for enhanced