I'm also in the market for a new fish finder. I think I'm going with the Garmin blue 160. I would go with the 240 but I'm running low on funds outfitting this new boat. Its just a matter of more pixels(160x160 or 240x240). When you have fish like striped bass that love to hug the bottom, more pixals means more detail between the fish and the bottom. If funds are limited(like mine), the 160 should be fine. If you can afford the more expensive unit - go for it.
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