This IPX7 waterproof rated, marine multifunction device combines CHIRP sonar with Down - Scan Imaging to give you a fish-eye view of the world under the water's surface. The Lowrance Elite-4 features a 4.3inch super-bright LED backlit, multi-window, color display for easy, all-access, 1-thumb operation. Navigating troubled waters proves easy with Down - Scan Overlay technology designed to produce image-like detail of fish, structures, and underwater terrain. GPS, HD mapping options, Track - Back recorded sonar history, and access to maps covering more than 18,000 lakes and rivers, and coastal contours combine to ensure you leave no hidden cove unfished, and that you can find your way back to the hot spots