The 50 kHz is designed for very deep water (usually deeper than 1000 feet). I don't think any Kayak fisherman is fishing that deep. Personally I would get the 83/200-455/800 kHz transducer if buying the HDI. My $0.02 , P.S. the 50 is more expensive also.
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MARK ......... 2016 MALIBU X FACTOR, 2020 SOLO SKIFF (Fishing Kayak on Steroids  )
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