The GPSMAP 431s is a compact marine navigator that features an ultra-bright 4? QVGA color display along with an improved high-speed digital design for increased map drawing and panning speeds. It's ready to go with a built-in, satellite-enhanced basemap preloaded with U.S. Inland Lakes and an easy-to-use interface designed to help you navigate the open waters with ease.

• Built-in sounder
• Dual beam transducer
• Preloaded with U.S. inland lake data
• High sensitivity GPS receiver
• 240 x 320 pixels QVGA color display
• NMEA 0183 compatible
• SD card slot; Internal antenna; Waterproof (IPX7)
• Audible alarms; Tide tables; Sun and moon information
• 3D map and Auto Guidance with optional BlueChart g2 vision card
• 3,000 waypoints; Track log: 10,000 points, 50 saved tracks