Fishfinder -- side looking

[Kent]

I am considering upgrading my fish finder, and one I am looking at has a side looking option for $90 more. I would appreciate comments that anyone has concerning these. How far to the side can one see (realizing that the depth of the water impacts this)? I know that many use these mounted to an electric trolling motor mounted to the bow of the boat; however, on my boat it would be a permanent mount on the stern. Will a side looking option work with the transducer mounted on the stern?

Thanks,
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