Recently, my buddy Kevin took his family on a trip that involved an geocache excursion. Geocaching is a type of world-wide scavenger hunt aided by GPS. Now THIS is useful technology.
More information about geocaching here.
A beginner's guide is found here.
There are a few off-shoots of geocaching . . .
Benchmark hunting here.
Waymarking(my favorite) here.
Degree confluence here.
International Orienteering Organization here.
Leterboxing North America (an interesting blend of geography and graphic arts) here.
Wherigo here.
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