The cache itself is not on the posted coordinates. To actually find the geocache you need a device that can handle wherigo cartridges.
It could be a smart phone or a dedicated GPS device. The cartridge itself can be downloaded here.
To be able to find this geocache, you will need these three codes which you will enter into your wherigo-software:
405138
435491
199052
Remember to always bring your own pencil, BYOP!