The Hitchhikers guide to the galaxy is a book by Douglas Adams, that became a cult series firstly on the radio and then on TV and the big screen.
Seconds before Earth is demolished to make way for a galactic freeway, Arthur Dent is plucked off the planet by his friend Ford Prefect, a researcher for the revised edition of The Hitchhiker's Guide to the Galaxy who, for the last fifteen years, has been posing as an out-of-work actor.
Marvin the Paranoid Android wants you to find the answer to the ultimate question, when you find it call it AB, look directly behind you for CD.
The cache cannot be found at the posted co-ordinates
To find the cache you will not need to use Deep Thought, just some simple sums
N52 (AB)/2 . 0(A+D) (D-B) E000 DB.0(A+B) (D-B)