Garmin GPSMAP 431 GPS Chartplotter Preloaded with U.S. inland lake data High sensitivity GPS receiver 240 x 320 pizels QVGA color display Waterproof (IPX7) NMEA 0183 compatible Garmin GPSMAP 431 GPS Chartplotter GARMIN GPSMAP 431 GPS CHART PLOTTER INLAND LAKES & RIVERS Internal/External Antenna = Internal | Resolution (VxH) = 240 x 320 | Screen Size = 4.0/3.2 x 2.4 | Screen Type = Color | Touchscreen = No | Waterproof Rating = Waterproof | Waypoints/Routes = 3,000/100 | Weather Capable = NONE | Cartography Type = NONE |