Got this for my dads fishing trips to put on his fancy boat, i thought i was going to really impress him with this shiny new toy.... Only to find out my step mom beat me to it. Bummer! Im tired of looking at it tho i paid over $800 for this but only asking $499>>>. Here is the online discription <<<<Expand the functionality of your chartplotter by using the Garmin® GXM™ 54 SiriusXM® Satellite Weather/Radio Antenna. This handy antenna adds detailed weather information directly to your Garmin chartplotter (not included) like current conditions, forecasts, NEXRAD radar, lightning, wind, and wave information. Fish Mapping™ suggests potential fishing spots based on conditions such as surface temperature, surface temperature front strength, 30-meter subsurface temperature, and plankton concentration. Finally, this powerful ally provides more than 150 channels of SiriusXM satellite radio, letting you listen to your favorite games, news, and music almost anywhere! Super-easy to install, the Garmin GXM 54 SiriusXM Satellite Weather/Radio Antenna provides reliable reception all the way to the fringes of SiriusXM coverage. Compatible with GPSMAP® 8400/8600, GPSMAP 7400/7600, GPSMAP 7x2/9x2/12x2 Touch and GPSMAP 10x2/12x2 chartplotters and chartplotter/sonar combos. Weather, radio, and mapping features require a subscription with SiriusXM. Manufacturer model #: 010-02277-00. Easy to install Reliable reception anywhere across the SiriusXM coverage range Delivers detailed weather information to your Garmin charplotter (not included) Fish Mapping uses ocean conditions to predict hot fishing spots 150 SiriusXM channels for entertainment and news