Luke, I think the VXR is a hand held unit?
I think they do detect fish, but I dont think they tell you how deep. I know some of the handheld units do, I cant recall which one.
As luke stated, clear ice is much easier to read through, and the readings will be better(true), I wouldnt depend on any flasher to tell me if there are fish down there through cloudy or thick ice without drilling a hole unless its crystal clear.. but its already a huge head start knowing the depth, and inspecting the structure before ever starting to drill.