Geocaching Trackables are tags or coins with a code that you can log online to track miles as it moves from cache to cache around the world!
A Beginner's Guide to Trackables – Official Blog
Trackable Etiquette – Official Blog
8 UK Cache Mag ideas geocaching, geocaching containers, geocashing
Geocaching > Trackables
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What are Geocaching Trackables?
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Geocaching 101: What is a Geocaching Trackable? - Peanuts or Pretzels
The difference between SWAG and trackables – Official Blog