GARMIN 010-01388-00 ECHOMAP74SV 7" COMBO BLUECHART G2 US NO TRANSDUCER High-contrast color display with keypad control with preloaded U.S. Blue Chart g2 maps Built-in DownVu and SideVu scanning sonar with the clearest images on the water Built-in 500 W (RMS) HD-ID sonar (4,000 W peak-to-peak) 5 Hz Internal GPS updates position and heading 5 times per second Tilting, quick-disconnect mount