I'd been vaguely interested in the idea of geocaching.  It was one of the groups available in our local U3A.  But I didn't want to spend real money on a handheld GPS device before knowing that the enthusiasm would last for a while.  Ahah!  I discovered that my iPad had a built in GPS.  Would it work in the field?  I looked up geocaching on the internet and found www.geocaching.com.  I was amazed at how many caches there were within a mile of home.  One was in the woods behind my house!  Oh, I've gotta look at this, thought I.  I noticed that it had a high difficulty and terrain rating, but I was sure I could manage.  I quickly solved the puzzle to get the co-ordinates.  I love puzzles :) Lots of nettle stings, bramble scratches and frustration.  Grr.  Perhaps I need to start on an easier one.  Found the free app from groundspeak and easily found all three of the easy caches within a mile of home.