I'm not so sure how important a mirror is to my situation either. Still working that one out. Signal mirror flashes seem to be ignored by all but trained SAR who are looking for you, and sometimes by them as well. Seems that signal smokes gets more attention simply because people are so paranoid about forest fires. These are not hard fast beliefs but rather things I consider to have some potential accuracy. I read alot of accounts of aircraft ignoring signal mirrors but reporting signs of fire.