RE: sonar
I think that Marin pretty much nailed it.
If memory serves me correctly, Jeff, on Arctic Traverler has one and loves it! He pokes his head into a lot of coves and can see if he's going to hit a rock, shelf, etc. I had one and loved it for "paddy fishing." I could look under kelp paddies to see if there were any fish, before getting too close to the paddy. By standing off and casting to the paddy, we were really successful.
For normal cruising, etc......you really don't need one. Charts (electronic & paper) and a good sounder are all you really need.
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