I saw that ATAK exists and saw a couple videos on some features. It's super cool.

To put it short it's a realtime user updated terrain and intelligence tool. It lets you set up waypoints for patrols, track opposition positions, keeps track of your guys and ties it in to terrain models so you can plot routes to avoid detection and reroute according to blocked paths etc.

It would be a full-time job to administer, but if you can get an adhoc network set up to communicate data with other users, you could give everyone a very nice tool to form a cohesive group that could set up supply lines and outmaneuver opposition.