When winter's ice seals waters, the puzzle of finding fish does not change. Unfortunately, the approach used by many ice fishermen often does little to solve that puzzle. Sitting in a shanty or watching the same tip-ups all day, waiting for the action to start, leads to a long winter with few fish. Pioneering ice fishermen like Dave Genz––a Minnesota angler who has developed many strategies now commonly in use, such as being mobile on the ice instead of fishing one spot all day--have refined…