Have tried my Hummingbird on the ice, with no problem, and it showed me fish, if they was a foot or so off the bottom, but if the fish was in that last foot of water, it would not show them.
If you are serious about ice fishing, get you a Vexalar flasher , i got the FL-8 Genz Box, and you will be amased at what you can see. IT WILL MAKE YOU A BETTER FISHEMAN.