Garmin GXM 30 Weather and Audio XM Satellite Receiver Compact, all-in-one XM satellite antenna for select Garmin GPS navigators Processes XM traffic, weather, and satellite radio services and sends to GPS display Requires XM NavTraffic, WX Weather, or satellite radio subscription for use Compatible with select GPSMap, StreetPilot, and zumo GPS receivers Measures roughly 3 inches in diameter; weighs 0.55 pounds; 1-year warranty