Garmin GPSMAP 521s w/dual frequency transducer

Large, ultra-bright 5" diagonal qvga display; 234 x 320 pixelsmore than 800 nits of brightness; nmea 2000 certified for seamless integration with the garmin marine lineup; preloaded worldwide marine basemap; compatible with gxm 51 for xm radio and xm wx satellite weather; built-in high-sensitivity gps receiver; high-speed processor for fast screen redraws & smooth panning; secure digital card slot for bluechart g2 vision cards, as well as saving waypoints, routes & tracks to a secure digital card; optional bluechart g2 vision cards provide marine chart detail & enhanced navigation features like auto guidance, satellite imagery, 3-d mariners eye view & 3-d fish eye view; backlit keypad for easy operation in low light conditions; power output: 500w (rms), 4000w (peak to peak), dual frequency; depth: 1,500 ft/ 500 m (dual frequency); uses a dual frequency transducer 50 khz (45), 200 khz (10) for maximum saltwater 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 & strong returns simultaneously; water temperature log graphically records water temp data; a-scope; whiteline; adjustable depth line helps gauge desired fishing levels & bottom clearance; split zoom display offers a closer look at fish targets & bottom structure; 2x, 4x & bottomlock zoom; adjustable keel offset; alarms for fish size, shallow water, deep water & low battery; dim: 5.9"h x 6.4"w x 2.9"d; includes transom mount transducer, power/data cable, mounting bracket with tilt/swivel & protective front cover