Garmin GPSMAP 547 10Hz GPS/GLONASS Receiver With the integration of a 10Hz GPS/GLONASS receiver, the 527 refreshes position and heading up to 10 times per second It displays constant and fluid on-screen location and proves to be incredibly accurate when marking and navigating to any one of 5,000 user-created waypoints It also has wireless connectivity, giving you the opportunity to connect and access marine-specific apps via smartphone or tablet includes worldwide basemap; US BlueChart g2 and US LakeVu HD data card