To begin tracking you obviously need a fresh track, and you can cover a lot of ground by driving the backwoods roads before daylight. Once you find one, you need to size up the deer that made it; if you're going to spend the day tracking, you want it to be worth the effort. Look not only at the size of the track, but how deeply it sinks into the snow. A track of 4 inches or longer was almost certainly made by a mature buck. An even better indication is width. A track that is 3 1/2 inches or more across comes from an old, big buck. If there are other tracks around, you can also judge the relative sinking depth of each--the deeper the track, the heavier the deer that made it.