Depends on what you want to spend. Marcum LX7 or MX7, Vexilar FLX28 or FLX30 and the Hummingbird Helix units are all good options. A little cheaper and will still get the job done in deep water are the Hummingbird 55, Marcum M5, and the Vex 20.
You may be on a drop or over larger rocks if you have a blind pocket at the bottom. You are putting a really large footprint down in 115 feet with an LX1.
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