Available in two models:

• GPSMAP 531 : 010-00761-00 Chartplotter only, will not accept a transducer
• GPSMAP 531S : 010-00761-01 Includes a Dual Beam Transducer

Features a large ultra-bright 5" 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 opsition on the water. They are ready to go with built-in cartography for inland U.S. waters (over 14,000 lakes) and Garmin's proven easy-to-use interface designed to help you navigate the waters with ease. 

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Where applicable, the sounder version, GPSMAP 531s, comes with a powerful dual-beam transducer that clearly illustrates depth contours, fish targets and structures whether you’re fishing in freshwater or off the coast. The GPSMAP 531 and GPSMAP 531s are also NMEA 0183-certified for easy connectivity with sensors, instruments and future marine offerings.

Features and Specifications:

• Large, ultra-bright 5" diagonal QVGA display, 234 x 320 pixels - over 800 nits of brightness
• Preloaded with charts for over 14,000 U.S. lakes and navigable rivers
• Compatible with GXM 51 for XM Satellite Radio and XM WX Satellite Weather
• Built-in high-sensitivity GPS receiver
• High-speed processor for fast screen redraws and smooth panning
• Two NMEA 0183 I/O ports
• Streamlined user interface makes it simple to select modes and features
• Single SD memory card slot for BlueChart g2 Vision cards, as well as saving waypoints, routes and tracks to an SD card
• Optional BlueChart g2 Vision cards provide marine chart detail and enhanced navigation features like Auto Guidance, satellite imagery, 3-D Mariner's Eye View and 3-D Fish Eye View
• Backlit keypad for easy operation in low light conditions
• Unit dimensions: 5.9"H x6.4"W x 2.9"D
• Owners Manual :  Download