Hidden and Dangerous? #3 (Coopers Hill,Willingdon) Multi-Cache
Hidden and Dangerous? #3 (Coopers Hill,Willingdon)
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Difficulty:
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Terrain:
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Size: 
(micro)
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Some mobile phone masts are easy to see and some masts are disguised. See if you can see the disguised mobile phone mast near this cache. (NB: the emissions from this mast appear to be sufficiently high that you might need to hold your car key fob over your windscreen if you can’t get the car doors to lock / unlock from a normal distance.)
STOP PRESS:
Until the vegetation grows back, the cache has been re-located to within a few feet of the telephone number mentioned below. You do not need to work out the formula.
Original text:
This is a single-stage off-set 35mm film container cache that is located within 100m of the start location.
There is limited on-street free parking nearby so it should be a good cache-and-dash location. The area can get very busy so, at the final location, you may need to come back another day and chalk it up to experience (yes, that was a hint).
First, you need to find the eleven-digit phone number.
Assume: ABCDE FGHIJK.
The correct location for the cache is a short walk away at:
N 50 48. (F-H) (D+J) (C-G)
E000 15. (C-(H+K)) (C-(J+B)) ((I+H)-D)
Please return the container to exactly where you found it (at the relevant Additional Hint location) so that the next person can also find it easily.
For more details regarding mobile phone mast locations: search "SiteFinder".
If anybody would like to expand this Hidden and Dangerous? series, please do. I ask that you let me (LostInTheWoods!) know first so that I can keep track of the Hidden and Dangerous? numbers, and names, so as to avoid duplication.
This also applies to the Watt Mast? series of transmitter sites.
Additional Hints
(Decrypt)
Grzcbenel: ng erne, ng tebhaq yriry.
Bevtvany: Irel arne gur fvk-one tngr.