Humminbird 767 Combo 5-Inch Waterproof Fishfinder and Marine GPS Chartplotter With Dual-Beam Transducer Full-featured fish finder with transducer, 16-channel WAAS GPS receiver with chartplotting and sonar all in one 5-inch, high-definition display with 640 x 320 pixels of resolution and 16-level grayscale Built-in 4 nautical mile resolution UniMap of USA inland lakes, rivers and coastal areas 60-degree, and 20-degree beam for both fish location better bottom definition Measures 6.9 x 7.7 x 4.5 inches (W x H x D), and reliable to 1500 feet of depth