Humminbird 580 Combo 5-Inch Waterproof Marine GPS and Chartplotter Completely portable fish finder with 16-channel WAAS GPS receiver with chartplotting, temperature, and speed 5-inch, 16-level grayscale FTSN LCD screen that sports 640 x 320 lines of resolution Dual-beam, with 20-, and 60-degree beam angles to deliver both wide coverage and better bottom definition Built-in 4 nautical mile resolution UniMap of USA inland lakes, rivers and coastal areas Comes with mounting hardware and manufacturer's 1-year limited warranty