The GA 38 GPS/GLONASS Antenna provides enhanced reception of both GPS and GLONASS signals for compatible Garmin chartplotters and combos.A robust external antenna, the GA 38 has a compact low-profile waterproof housing that measures 3 5/8" x 2" and weighs just 7.1oz. It allows three easy mounting options: pole, surface or under-deck (for the underside of fiberglass decks).As an external antenna, it provides GPS/GLONASS antenna installation flexibility for compatible chartplotters with a built-in GPS/GLONASS receiver. For those products with built-in antennas installed in the salon or other interior space, an externally mounted GA 38 can provide enhanced reception of GPS/GLONASS signals.What's in the Box GA 38 Antenna Surface mounting bracket Pole mounting bracket Under-deck mounting bracket Mounting hardware Antenna cable (32 ft/10 m) Installation instructionsInstallation Instructions