The echoMAP sv series offers built-in traditional HD-ID sonar and SideVu technology for incredible scanning ability on the water. The internal 5Hz GPS updates your position and heading an amazing 5 times per second, so your waypoints and navigation stay incredibly accurate. The echoMAP 74SV also offers wireless connectivity capability and comes with a dual-beam 50/77/200 kHz transducer with built-in water temp sensor. Preloaded with U.S. BlueChart g2 cartography. Dual microSD card slots for adding maps. 5,000 waypoints/100 routes. Waterproof to IPX7 standards. 500 watts RMS. Max. depth: 2,300' freshwater/1,100 saltwater. Includes echoMAP unit, dual-beam transducer, power/data cable, quick-release mount, trolling motor mount, hardware, and documentation. Unit measures 9.8" x 5.5" x 2.0".