I have tones turned on and get proximity alerts as per my settings when navigating to a specific cache.  I have a 66st but I saw an old thread elsewhere where someone with a 64 say they had their unit set so that it alerted when they got within a certain distance of any geocache. The thread was really about something else and that person did not elaborate and was not questioned on how they did that.  Is it really possible?   I can not find a way to alarm when I just happen to get near any geocac