There are no rules in the books regarding tracking, though tracking is often mentioned as an activity the adventurers would do. The wolfin racial talent is also very focused on tracking prey. Any input on how you are handling tracking? The obvious roll for it is survival, and perhaps tracking is something that can be done as an activity while traveling the map (just like leading the way, scouting, foraging for food etc). I feel like the person who is leading the way also should do the tracking, or it would be a bit strange. Perhaps tracking someone or something can be baked into the roll for leading the way, with modifiers?
There are a bunch of rules for hunting, however all of that seems to pertain to felling wild animals for meat and pelts. On the other hand I feel like any talent that gives you modifiers to hunting should also give you the same modifiers to tracking prey over long distances. Maybe :-)