Garmin GPS Antennas
Garmin GPS Antennas
Garmin pairs decades of GPS heritage with some of the most capable sonar and chartplotting on the water. This is the Garmin gps antennas range: external GPS and GNSS antennas for a fast, stable fix.
Browse the full Garmin range or GPS Antennas from every brand.
When to add an external GPS antenna
Many Garmin chartplotters have an internal GPS receiver, which is adequate below decks or on a flybridge with a reasonably open sky view, but an external antenna generally locks on faster and holds a more stable fix on a boat with a lot of surrounding structure, a hardtop, or a below-decks helm station. External antennas also support GPS, GLONASS and Galileo constellations on current models, improving fix reliability in marinas or under bridges where satellite visibility is reduced.
Mounting height matters more than antenna size: fitting the antenna as high and clear of the boat's own structure as practical, away from radar and other transmitting antennas, gives the cleanest signal. Output is usually over NMEA 2000, so check that your chartplotter's network has a spare connection point before adding one, and confirm whether the antenna needs its own power drop or draws power from the network backbone itself.
