The cache is less than three, but greater than one kilometres from the above dummy co-ordinates.
The solution to the following puzzle will provide the information required to find it.
The cache is located at:
S34° 53.(A+B)(C-D)(E+F)'
E138° 35.(U-V)(W+X)(Y-Z)'
The size of the container is greater than a nano, but less than a small sistema. It is more or less magnetic and contains a logbook and pencil.
Enjoy!