A oes unrhyw un wedi dod ar draws y term hwn? Mae'n cyfeirio at weithgareddau gan ddefnyddio offer gps:
Earthcaches are virtual caches that are organized by the Geological Society of America. The cacher usually has to perform a task which teaches him/her an educational lesson about the earth science of the cache area.
Unrhyw awgrym ogydd?
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