Garmin GA 38 GPS/GLONASS Antenna [010-12017-00] MRP and high frequency versions provide

and high frequency versions provide maximum flexibility for the choice of frequencies

It fits existing hole patterns

with few tools

drift vectoring and plotting a line of position

Garmin GA 38 GPS/GLONASS Antenna [010-12017-00] MRP and high frequency versions provideGA 38 GPS GLONASS Antenna 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 waterproof 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 reception of GPS