Re: response by mcorsar...
Correct. The question was indeed "what to do if it happens", and correct again, your answer is quite simple. In fact, if I were to take it to heart I might even think you were passing judgement on a noobie such as myself, thinking I didn't "do my best to avoid the situation." In fact, I choose to hike outside of the neatly packaged maps with dot-to-dot boundaries from time to time, accessing hikes from state land and trying to exit via state land. I was more or less just curious to hear other folks' tales regarding this kind of experience, but since your tally provides you with no such experience, thanks anyway...