The few times I've been out on the lake I've been picking up the bubbles as fish. I mostly use my ff as a constant guide for the bottom. But, the mass show of fish on the screen has stopped me in my tracks fishing like a mad man only to find out it just little bubbles popping. Seems like there are alot of areas that have constant bubbles popping. Anyone else have this, and if so how do you deal with it. I tried fine tunning the sensitivity to the point of blocking out even the fish. I've just been sight fishing. But, now that the fish are deeper I will have to rely on my ff.