What is Geocaching?
(official site)

Geocaching is an entertaining adventure game for gps users. Participating in a cache hunt is a good way to take advantage of the wonderful features and capability of a gps unit. The basic idea is to have individuals and organizations set up caches all over the world and share the locations of these caches on the internet. GPS users can then use the location coordinates to find the caches. Once found, a cache may provide the visitor with a wide variety of rewards. All the visitor is asked to do is if they get something they should try to leave something for the cache.

What is a GPS device?

A GPS unit is a electronic device that can determine your approximate location (within around 6-20 feet) on the planet. Coordinates are normally given in Longitude and Latitude. You can use the unit to navigate from your current location to another location. Some units have their own maps, built-in electronic compasses, voice navigation, depending on the complexity of the device.

Local sites (yorkville):
 

 

regular cache 10/31/2001
1.45mi E
 
  "Young Lyon" by Two Campers & Bspeng (GC25BC)
(Illinois)
last found 1/12/2002
2/2.5 [details]
 
 
regular cache 11/25/2001
1.82mi SW
 
  "Kendall's Highpoint" by Two Campers & Bspeng (GC2A2C)
(Illinois)
last found 1/12/2002
2/2.5 [details]
 
 
regular cache 4/20/2001
2.58mi NE
 
  "Saw Wee Kee" by photojon (GC778)
(Illinois)
last found 1/12/2002
3/3.5 [details]
 
 
regular cache 11/11/2001
4.38mi W
 
  "The Hall of Justice" by Markwell (GC27B6)
(Illinois)
last found 1/12/2002
1.5/1.5 [details]
 
 
virtual cache 1/5/2002
5.09mi W
 
*new* "Great Village of the Maramek Cache" by TwoCampers (GC305F)
(Illinois)
last found 1/12/2002
3.5/4 [details

 

TWOCAMPERS FAVORITES
 

virtual cache 1/5/2002
5.09mi W
 
*new* "Great Village of the Maramek Cache" by TwoCampers (GC305F)
(Illinois)
last found 1/12/2002
3.5/4 [details]