Picture a Mega Alphanumeric Mystery Cache
Zetetic: Archiving as GZ isn't what it once was, like geocaching in general. [:(]
Picture a Mega Alphanumeric
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Difficulty:
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Terrain:
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Size: 
(small)
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The picture clues for this cache will first be available to Supporters at Mega Wales 2011 (GC2921G this link) on 31 July 2011. A week after the event, the clues will be uploaded to this listing. Solve the clues to find the cache location, within a mile of the event venue, the Brangwyn Hall. The cache is a small plastic storage box. This cache meets the GAGB Urban Placement Guidelines.
The reference coordinates for this listing are not where the cache is hidden. If you try to go there, you will find it a bit damp.
The picture clues for this cache will be in the souvenir brochure in the Supporter's Packs, which will be given to their purchasers at the Mega event. This is to give Supporters an exclusive opportunity for a “first to find”. After the Sunset on the Welsh Mega event, the picture clues will be uploaded to this listing, opening up the cache to everyone. Recognising these unusual arrangements for providing clues, this cache is published with the special permission of Groundspeak. There are seven picture clues, identified by the word “Alphanumeric” and one of the numbers one to seven (these numbers are not the answers you are seeking). Each picture should suggest to you a number and a corresponding letter.
You will find the cache at:
N51 3J.KL3 W003 5M.NP6 where:
J = W - H
K = T – C
L = G + H + Y
M = T
N = S and
P = Y
Additional Hints
(No hints available.)