Lowrance LMS-525C DF 5-Inch Waterproof Marine GPS and Chartplotter with Sounder Designed for salt water or downrigger tracking; combines a sonar and GPS navigation for fast, accurate navigation Includes a built-in custom background map and a 50/200 KHz skimmer transducer Offers a five inch, 256-color 480 x 480 SolarMAX TFT color display for superb sonar target detail and separation Compatible with NMEA 2000 networking; five-pin Ethernet expansion port for radar, video and satellite radio Easy-to-use system helps you find fish in dazzling color