This Wherigo is easy. Once you have the cartridge on your gps device it becomes a virtual version of the "Reverse Cache Box." You will need to enter the key listed below (the 3 numbers) that are unique to each reverse wherigo. Once you have done this you will then be able to run the cartridge which tells you the distance to the cache, but not the bearing. You may begin your search from any spot in the world. You may use this cartridge on any reverse wherigo that uses the same cartridge page created by -Waldmeister.
Cartidge for Reverse Wherigo https://www.wherigo.com/cartridge/details.aspx?CGUID=dcdcd2ff-c171-4487-93bc-678f6d03ac4f
Iphone users app is call Wherigo
Android Users app is call Whereyougo
These are the 3 numbers that you will enter as the "key" so to speak that is unique to each individual reverse wherigo and will not give you coordinates but rather indicate the distance to the final/geocache. Your task is to find the geocache using the box as little as possible for checking the distance.
159388,234302,250789
002300,008080,900008