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I have a Humminbird 788ci that is used on the bow of my boat for verticle jigging. Several years ago I got the portable case w/ battery and ice ducer for using the 788ci on the ice. It works great, no problems seeing small ice jigs or watching fish react to the jigs. Also because I can use Navionics/Lakemaster maps in it I don't need a handheld GPS for marking waypoints and I know exactly what I'm fishing over or near.