Lowrance LCX-28C HD 7-Inch Waterproof Marine GPS and Chartplotter (50/200 kHz Transducer) Rugged, built-in, shock-resistant 30 GB hard drive, preloaded with a wealth of electronic maps and charts for coastal and inland navigation Advanced sonar receiver technology reduces interference and enhances sensitivity and picture quality; built-in 50/200 kHz dual-frequency Offers an easy-to-read, seven-inch, diagonal, 480 x 640 TFT color display with cold cathode back lighting Comes with a one-year warranty Easy-to-use system combines champion-grade sensor with GPS receiver