The Humminbird 688ci HD Combo is another unit with an excellent price / quality ratio. It's the unit that comes to take the place of the similar, discontinued units, 788ci HD Combo and 587ci HD Combo. This fish finder has the same screen format as the other other units within the 600 series, 5-inches in diagonal, 640V x 480H pixel resolution, high definition, full color with … [Read more...] about Hummingbird Fish Finder 688ci HD Combo Review