Geocaching--A Potential New Hobby For Me?

While reviewing some pricey iPhone apps today, I came across one involving called iPhone Geocaching from Groundspeak. I was somewhat familiar with the hobby of Geocaching before now, but had never really paid it any serious attention for the simple fact that I don't own a GPS unit. At least, I thought I didn't. It turns out, the new iPhone 3GS I purchased last month gives me full GPS capability. Coupled with this new app, it would appear that I can get out there and play the game with everyone!

From Wikipedia:

"The first documented placement of a GPS-located cache took place on May 3, 2000, by Dave Ulmer of Beavercreek, Oregon. The location was posted on the Usenet newsgroup sci.geo.satellite-nav as 45°17.460′N 122°24.800′W / 45.291°N 122.4133°W / 45.291; -122.4133. By May 6, 2000, it had been found twice and logged once (by Mike Teague of Vancouver, Washington). According to Dave Ulmer's message, the original stash was a black plastic bucket buried most of the way in the ground and contained software, videos, books, food, money, and a slingshot."

The main web site for this past time (is it a hobby or a sport?) is www.geocaching.org. According to this web site, there are, at present "1,004,652 active caches and an estimated 3-4 million geocachers worldwide." Now, that's an impressive amount of activity for a past time that began only ten years ago.