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The Differences Between a Garmin GA 30 and a GA 38 GPS Antenna
The GA 38 GPS/GLONASS Antenna is the replacement for the GA 30 GPS Antenna.
The GA 38 still uses a BNC connection and is compatible with any device that the GA 30 was compatible with.
The difference between the two, is that GA 38 antenna is compatible with the GLONASS satellite system. This allows for better satellite reception.