This is a Wherigo cache, which can only be found by downloading a Cartridge onto your GPSr or using an app on your phone. I have tested it with the c:geo app on my android phone which worked successfully, and the Cartridge itself has been used for numerous caches around the world. You will need to download the Reverse Wherigo Cartridge created by -Waldmeister-, which is available to download here.
The Cartridge tells you how far away you are from the final cache hide, but not the direction in which you need to go. Once you start the Cartridge going, set it up by choosing your language and measurement unit. Then input that you want to Play (not Create) a Reverse Wherigo. Then input three 6-digit numbers (see below) one at a time. You can then look in your Inventory for the Reverse Cache Box. Click on that to display the distance to the cache. The Cartridge keeps a tally of how many times you look at the Reverse Cache Box to get the distance, although it doesn't matter how many times you look, but it can be fun to use it as few times as possible. When you are within 25 meters of the final location, the coordinates will be revealed.
Start at the base coordinates:
Here you will find a stone built bus shelter serving both sides of the road. There is a number for the bus stop displayed on a clear sign on the side of the shelter (not the call or text number). Take the last 4 digits of this number and assign them the letters A to D:
450 2ABCD
Then, substitute the letters A to D into the following formulas to give the three 6-digit numbers needed to configure the Wherigo cartridge:
005C6A
665AC8
02D7B1
Keep hold of these numbers: if the cartridge crashes you will need to put them in again to continue.