Garmin GPSMAP 441S GPS Chartplotter & Fishfinder Combo without Transducer and features an ultra-bright 4" QVGA display along with an improved high-speed digital design for faster map drawing and panning speeds. Plus, these waterproof units have a high-sensitivity internal GPS receiver, so mariners will always know their position at sea. It's ready to go with built-in BlueChart g2 marine cartography of the coastal united states - including Alaska, Hawaii and Explorer Chart data of the Bahamas. Mainers can navigate the open waters with ease knowing that these new units include Garmin's proven easy-to-use interface design - Alarms for fish size, shallow water, deep water, and low battery