Hi

Not sure if gimmick or not.
Ibobber
http://www.macsense.co.nz/shop/ibobber-bluetooth-smart-castable-fishfinder/
Deeper Fish finder
https://buydeeper.com/fishfinder/deeper

Bought a couple of kayaks. Looking at FF options. Read that screen resolution is reasonably important and that is a contributor to cost. Thought why not a smartphone with an ip8 cover and a transducer. googled. and found the above.

Looks to be 2 or 3 main options ranging from USD 99 to 240 ish

Where this would win over a hard mounted option for me is that it can be used off the shore (supposedly)


Anyone seen or read or heard anything that isn't a paid review on these?