For boaters looking for the ultimate in portability and versatility, the GPSMAP 376C Portable Navigator has it all. This color plotter offers satellite weather capability along with both marine and land navigation modes in one space-saving package. You can even pair it with the GSD 20 remote sounder module to add sonar capability, or customize map data for your adventures on land or sea with optional MapSource cartography. With a subscription to XM WX satellite weather's master mariner package, users can see continuously-delivered weather on the unit. So you can spend more time enjoying the water and less time worrying about the weather. You can enhance the basemap detail by downloading data from optional MapSource DVDs or CDs to an optional Garmin data card, or by plugging in data cards preprogrammed with BlueChart or Fishing Hot Spots detail.