SeaCharter® Series Sonar/GPS units feature 4,000 watts peak-to-peak power and depth capabilities to 1,500 ft. dual frequency transducer. Up to 60° of fish-detection coverage. Built-in temperature and speed sensor. The 642c iGPS features a built-in GPS antenna. 5" diagonal 640x480-pixel, 256-color enhanced TFT sunlight-readable display with wide-angle viewing and 42 graphic icons. Waterproof slot for MMC card. 12-parallel-channel GPS with WAAS that saves up to 1,000 waypoints. There is a built-in background map with enhanced continental U.S. and Hawaii.