I use a humming bird 718, (5" Black and white) on both of my kayaks, and the 798 on my small boat,
I wouldn't spent lots, if its likely to get wet, and covered salt spray, I like the extra size of a 5" screen over the small compact models,
I view the ones on my kayak as consumable, as beach launching on the west coast, is a tad hard on gear sum days,
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