Garmin GPSMAP® 531S GPS Dual Beam Combo

Garmin GPSMAP 531S Combo - Includes dual beam transducerFeatures 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. 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 Sing