Garmin External GPS Antenna with Mount

The Garmin External GPS Antenna comes in a sturdy, compact, and water-resistant casing, providing an excellent boost in performance and an array of installation options. For those with GPS mounted inside a vehicle, especially in a cab with limited sky visibility, it's highly recommended to use this external antenna. 9.8 ft (3 m) long cable Water resistant 10 mHz updates 10x per second Compatible with Garmin Tread XL GPS units when used with the Locking Magnetic mount or the Baja Dock.