Quote Originally Posted by Strifexgx
The Arrow was located at the tailes crash site (or within a short range of it) I believe they hiked 3 days or so (basing on memory so could be slightly off)
Well....it took 3 days because they took the longest possible route by following the coast in order to avoid confronting "the others".

Maybe it was a different perimeter that represented the "incompatible with 108" message.
Or maybe, since the ideal configuration was 2 guys alternating 12 hour shifts, the perimeter represented how far a person could travel in the span of 6 hours.