Advanced Triangulation 4 Multi-Cache
Cache Effect: With the first three stages of this series archived there is no way for those that seek the cache to come up with the required information. A multi cache is designed for those that seek the cache to visit additional locations to gather the required information for the next stage - this cache no longer has additional location and some of the information to find it is no longer available. For this reason I feel that this cache needs to be archived.
Thanks for your understanding!
Cache Effect
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Difficulty:
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Terrain:
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Size: 
(regular)
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Cache is not at the above coordinates. You must solve parts 1->3 of this cache to find this one.
Coordinates are for the top of the Calgary tower.
Since this cache was placed, parts 1 and 2 of the series have been archived, so I'll give you the hints from them (but you'll have to find the original coordinates of them yourself).
AT1: 10000
AT2: 23611.19682
The numbers given are pseudo-distances. That is to say that they are related to real distances through a scale factor. (1m = nn.nnnnn units). I had some difficulty solving this system algebraically, but there is a unique solution. You may have to make some approximations to get a meaningful solution (remember coordinates only need to be accurate to a couple of meters).The easiest way to solve this, is probably using successive approximations for the scale factor.
Additional Hints
(Decrypt)
Erzrzore, bayl gur engvb bs qvfgnaprf npghnyyl znggre, abg gur qvfgnaprf gurzfryirf.
Treasures
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