Before you dive in to the expensive world of FFS, just know that some folks, including me, believe that the powerful LS signal seems to turn-off alot of shallow fish when ice fishing – and even a fair amount of deep fish. From my experience, the range at which fish begin to sense and respond negatively to the LS signal is around 40′ from the transducer
I have heard this before and have tried a little to see if it is true, my very limited experience with LS it hasn’t seemed to make much of a difference but who knows really, maybe I could have done much better had I shut it off.