With a high-sensitivity GPS receiver for superior satellite tracking and quicker acquisition times, the Garmin 536S GPS Receiver can receive U.S. graphical weather data via optional GXM 51 satellite receiver/antenna. Garmin GPSmap 536S Series Marine GPS Receiver: * 5" diagonal VGA display * 480 x 640 pixels * 800 nits of brightness * NMEA 2000 certified for seamless integration with the Garmin marine lineup * Garmin Marine GPS is preloaded with charts for over 14,000 U.S. lakes and navigable rivers * Compatible with GXM 51 for XM Radio and XM WX satellite weather * Power output: 400W (RMS) 3200W (peak to peak) * Depth: 900" * Garmin Marine GPS includes a dual beam transducer 80KHz (45 degrees), 200KHz (14 degrees) for maximum freshwater performance * Patented transom/trolling mount transducer * Ultrascroll high rep rate sonar provides lightning-fast screen updates * Autogain technology enhances target visibility * See-Thru technology shows weak and strong returns simultaneously * Water temperature log graphically records water temp data * Round flasher display mode (in dual beam mode) and a-scope * Whiteline * Adjustable depth line helps gauge desired fishing levels and bottom clearance * Split zoom display offers a closer look at fish targets and bottom structure * 2x, 4x and bottomlock zoom * Adjustable keel offset * Alarms for fish size, shallow water, deep water and low battery * Secure Digital card slot * Dimensions: 5.9" x 6.4" x 2.9"