One for the Team Multi-Cache
Petrolia Discovery: Time to put this one to rest.
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Difficulty:
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Terrain:
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Size: 
(small)
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This is one for Team Namthcof. A bit of simple maths for Bob and a bit of a bushwhack for Barb. You won't find trails here, after heavy rain you may find water and who knows what dangers are lurking in the undergrowth. There is an old oil well very close to the final location with a pit full of water. Be careful not to fall in. Make sure you take your geocaching kit with you. You might need some extra equipment to retrieve the cache.
At the posted coordinates you'll see a number. Look upside down and you'll see another number. That's the one you need - we'll call it X. Divide by 2 and you'll get Y. Subtract 1 from Y and you'll get Z. Now subtract .0ZY from the N and subtract .0YY from the W. Now see if you can find the cache.
Please note that all Petrolia parks and recreation areas are closed between the hours of 11pm and 7am. The areas are patrolled and you will be fined.
Additional Hints
(Decrypt)
Vs lbh ner univat gebhoyr ernqvat gur ahzore ng Fgntr 1 orpnhfr bs zhq vg'f Bu Bar. Fb abj lbh fubhyq or noyr gb svther bhg gung K vf .....