As Easy As ABC Mystery Cache
Simply B: Time to archive this mini series, thanks for all the enjoyable logs on it.
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Difficulty:
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Terrain:
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Size: 
(regular)
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Act like a GPS to find this cache.
The cache coordinates mark the start of a public footpath. There's a pub car park very close by.
To find this cache you need to find caches A, B and C. In each of their log books we've written how far away that cache is from this one. Use that information to trilaterate the location of this cache, just like your GPS receiver does from the GPS satellites.
Two caches should be enough for you to make a good guess, all three will confirm the location.
You may find the attached map graphic useful as a guide to where this cache is hidden. It shows A, B and C and public rights of way. Draw a circle of the right distance around A, B and C ... and the cache is hidden where the three circles meet. Once at that location, you can use your GPS to fine tune your position by measuring how far away you now are from A, B and C. All this is subject to usual GPS inaccuracy, of course, so we've also provided an explicit hint - only use that if you're really stuck!
All measurements are averaged GPS readings. I have also plotted them all in my mapping software, and the calculations in that all came out the same to within 2 metres.
Additional Hints
(Decrypt)
Snyyra gerr gung vf arnere gb fgvyr guna oevqtr.