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Mystery Tour #2 - Herringbone Mystery Cache

Hidden : 1/1/2012
Difficulty:
2 out of 5
Terrain:
1.5 out of 5

Size: Size:   micro (micro)

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Geocache Description:

2nd in a series to celebrate being given the complete OS map of GB for Christmas
If you have completed #1 you will know what to do.
This type of driving instruction is known as a Herringbone

Only use Yellow roads. No side roads or tracks

Start at the above co-ordinates and head north.

To calculate the final location

Height at 2nd spot height = ABC

Height at 3rd spot height = DEF

Difference in Height = GH

the cache is within ½ mile of the final point and can be found
at

N 51. 0(D+E).(A*H)BE

W 001.0G.C(G*A)B

Cache is close to road, take care of children and animals

This is the Map


Additional Hints (Decrypt)

Zntargvp

Decryption Key

A|B|C|D|E|F|G|H|I|J|K|L|M
-------------------------
N|O|P|Q|R|S|T|U|V|W|X|Y|Z

(letter above equals below, and vice versa)