I just started looking for one as well and I'm thinking about the Furuno 620. I have an older Garmin Combo unit that is also the back up GPS to my 210 Garmin 10" GPS. I am a huge Garman fan, but I think the older Garmin fish finders are very weak therefore I'm looking to replace it with a dedicated fish finder.
My problem is space, I already have 2 GPS's and a large radar screen on a 23 SeaCraft. I'm looking for the best small unit I can find.
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