Vesper GA 38 GPS/GLONASS Antenna f/Cortex V1 M1 [010-13305-00]GA 38 GPS GLONASS Antenna for Cortex V1 & M1 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