Such a shame we can't do that know in the ATC
Do remember an Easter Greens Camp at Folkestone a couple of years ago when a nitex went slightly Pete Tong.
Groups were asked (told) to navigation aound the training area, with map and compass (and radio for safety.......).
We could hear one group getting quieter and quieter, so we send out a staff team to track with no luck. So staff went mobile in LRs and even Cdt SNCOs got involved.
Eventually the little darlings were found after we asked them to highlight landmarks they could distinguish (remember this is night time). The reply on the radio was "we are near a mast with a red light on top"; the otherside of Hawkinge. How we laughed, not.....