Geocaching
"Geocaching is a hobby that combines hiking and treasure hunting with the latest advances in portable global positioning system devices. Cachers, as they like to be called, hide waterproof containers — caches— and mark their exact locations with GPS coordinates that are posted on the Internet. Other cachers get the coordinates, punch the numbers into hand-held GPS receivers and follow the digital directions to the hidden prizes." (http://www.latimes.com/features/lifestyle/cl-wk-cover16feb16,0,2520493.story?)
How to start geocaching?
"To try geocaching, you will need three things: a GPS receiver, access to the Internet and a comfortable pair of shoes.
Global positioning system receivers cost $100 to $1,000, depending on the capabilities they provide. Look for a GPS receiver that makes it easy to enter longitude and latitude coordinates, also known as waystations.
There are several websites that list cache coordinates, but one of the most popular is Geocaching.com. Website membership is free. Log in, type in your ZIP Code and the website produces a list of caches in your area, including coordinates, clues and a difficulty rating for each cache." ((http://www.latimes.com/features/lifestyle/cl-wk-cover16feb16,0,2520493.story?)