This is a Challenge Cache. Cache IS located at the posted Coordinates. To log a find on this cache, you must have found, signed, and qualified for 250 Challenge Caches before you can claim your smiley on this one. A Bookmark is the best way to demonstrate you qualify for this one. Or you may post your list in your log. The 5D-5T rating is for the cumulative effort involved in find all the challenges as well as their qualifiers.
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