Garmin 010-00761-00 GPSMAP 531 Series GPS Receiver 5-inch LCD display 234 x 320 pixels Preloaded with charts for over 14,000 U.S. lakes and navigable rivers Built-in high-sensitivity GPS receiver 2 NMEA 0183 I/O ports Large, ultra-bright 5 diagonal QVGA display 234 x 320 pixels Preloaded with charts for over 14,000 U.S. lakes and navigable rivers Built-in high-sensitivity GPS receiver 2 NMEA 0183 I/O ports