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This is one of the best fish finders from Humminbird with monochromatic display. Apart from that it has quite a multitude of features which can make it quite a reliable unit. The Hummingbird Fish Finder 581i Combo is endowed with a high-resolution 16 lvl grayscale display, 5-inch wide, 640 x 320 pixel resolution. Since this unit has a FTSN LCD display, it requires less power … [Read more...] about Hummingbird Fish Finder 581i Combo Review