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Arduino: Ray of Light Mystery Cache

This cache has been archived.

cano: Looks like I won't be able to maintain this cache anymore, although I'm planning to make something similar in the future, I don't want to disappoint cachers looking for it or hog the associated locations so I'm archiving it.

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Hidden : 3/18/2013
Difficulty:
3 out of 5
Terrain:
2 out of 5

Size: Size:   small (small)

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Geocache Description:

The cache is not at the posted coordinates.

However, at the posted coordinates, you will find something that will help you to determine the real coordinates of the cache. Direct full sunlight is required, good luck finding that in woods. You also need to be able to solve system of differential equations. Just kidding, you just need to know how to count to ten. As usually you can use any means to solve the puzzle except friend on the phone.

Congratulation to mainiac1957 for FTF

Additional Hints (Decrypt)

gjva gerrf/gerr fghzc

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)