The cache is not at the listed co-ordinates. To find it you'll need to play a little Wherigo game. It's a simple enough little adventure - I'm sure everyone has wanted to be James Bond at some point in their lives. The cartridge you need can be downloaded from here:
To find out more about the Wherigo concept click here:
Hope you enjoy it....
It would seem this that iPhones have issues running this cartridge. However it *does* run on Android devices