How Geocaching Works
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Note: The posted co-ordinates are bogus.
However, GZ is within 1 km. of them.
All the information you need is in the following BMP. To download it, click here. However, you will probably need the clue in BMP #1 in order to access it properly.
It is a 400 ml sistema box with room only for small swaps.
If you are uncertain of your answer and want confirmation, please feel free to email me your calculated co-ordinates and I will verify them for you.
(No hints available.)