While in a state of confusion, I found myself in Constantia, so I placed this cache.
To find the cache, calculate the following:
\(x = e^{iπ} + 2^{gφ^2-2π}\)
Add x to the minute components of both the north and west posted coordinates, rounding to the nearest thousandth. Then go find the cache!
By the way, 
and φ both mean the same thing, at least in mathematics. Don't be confused if you find that one written either way.
You can validate your puzzle solution with
certitude.