I understand that geocaching is not exactly approved (even if not specifically forbidden) in many wilderness areas. It probably depends on the jurisdiction. I think that in many places, the Forest Service is still trying to find out what impact geocaching has before issuing any rules.

Of course, with a scout troop, you will run up against the limits on party size in wilderness areas. Those are specific, often different for each wilderness area, and in a very few popular areas, different for a part of a wilderness area. Out here in the Pacific Northwest, the most common party size limit is 12 persons. Sometimes it's 12 heartbeats, which means that dogs and pack animals are included in the limit. In at least one popular area, the limit is 6 (no dogs or pack animals allowed). Other places, I've seen a limit of 15-20 people. If a larger group is split, each part has to stay at least a mile from the other at all times, no going back and forth. This means you'll probably have to avoid wilderness areas altogether.

If you can find more leaders, I'd suggest splitting the troop (if all 60 come) into smaller groups, wherever you are. Less impact on the environment, and definitely easier to keep track of everyone!

In any case, a phone call to the appropriate ranger station when planning the trip to find out the rules for that specific location is a good idea.