X Marks the Spot
Gone are the days of the wrinkled map marked with an X but treasures can still be found using the modern-day method of geocaching. Like the old-fashioned treasure hunt, participants seek out hidden containers, called geocaches, using GPS devices or smart phone applications, then report their experiences online. According to Geocaching.com, there are 1,188,372 active caches and between 4-5 million geocachers worldwide. For more information on geocaching in Michigan, visit the MiGo website and look for a hunt in your area.
The geocaching handbook by Layne Cameron ; with a foreword by Dave Ulmer
The complete idiot's guide to geocaching by the editors and staff of Geocaching.com