The Clacks System Mystery Cache
shirty demon: The landowner has recently carried out some work around GZ and, as a consequence, the cache is no longer viable and has been removed.
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Difficulty:
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Size: 
(regular)
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The cache is not located at the given co-ordinates, and there is no need to visit that spot. This one of a series of puzzle caches which have some relation to the Discworld novels of Terry Pratchett. Those of you who are familiar with his writings will already have enjoyed the terrible jokes, running gags, and surreal humour which pepper the works. Those of you who are not familiar with his writings, are missing out on a great deal of pleasure.
The true cache location can be obtained by solving the following puzzle. The clacks is the informal nickname for the system of shutter semaphore towers which occupies roughly the same cultural space as telegraphy in nineteenth century Europe. They are described as having eight large square shutters flipping between black and white, viewed by telescope from the next station 20 miles away, and having been in use for centuries. The clacks stretch along the Sto Plains, into the Ramtops and across the Unnamed Continent to Genua. It has become the Discworld's first telecommunications network. While the system structure is that of a telegraph, elements of it are often described as similar to the Internet; for example, it threatens to make the Post Office obsolete in Going Postal and is sometimes described as 'c-mail' (a clear reference to e-mail). 'C-commerce' is also carried out on it. The true cache location is given by N 50 5A.BCD W 000 5E.FGH where A = 26523865 - 26523497 B = 26523837 - 26523836 C = 26523524 - 26523498 D = 26523524 - 26523842 E = 26523865 - 26523836 F = 26523837 - 26523835 G = 26523523 - 26523524 H = 26523839 - 26523483 A correct solution of the puzzle will give you a checksum (all 15 digits) equal to 48
Additional Hints
(Decrypt)
[Cache] Vafvqr Ubyybj ZGG "Fghzc"