what exactly is concidered to be "off-map"? where the ingamemap shows a the terrain in a slilgthly different color or the end of the maps you find of Chernarus online? such as http://media.taterunino.net/Chernarus.jpg our camp is within the the ingame map edge but not visible on online maps, should we move the camp?
to be honest i think its fine as it is, the zombies aren't blind, it would be unrealistic to be able to simply go right past them without them noticing, if you want to avoid zombie detection go play during the night...
i think this goes against rocket's wish to make the UI as minimal as possible, the only reason there is indicators at all atm is that he haven't figured out how to replace them with sounds/effects yet.