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Garmin GXM™ 53 Antenna | GXM™54 Cable Extensions
The GXM™ 53 antenna | GXM™ 54 antenna uses a 9-pin Ethernet cable extension and comes in three available lengths. The 9-pin GXM Ethernet Cables can have a maximum run of up to 100 meters. To add a GXM 53 antenna or the GXM 54 antenna Ethernet Extension Cable, a GXM Cable Coupler is required.