To locate the cache, a deck of cards will be helpful but not
totally necessary. Any fifty-two card deck will work. You need to
arrange them in a particular order to solve for the coordinates.
First separate the suits. You'll be making four face-down piles,
one for each suit.
The top card for hearts will be five. The card beneath that is
six and so on until your are left with a four on the bottom. The
top card for diamonds will be the king, and the card beneath that
will be the queen and so on until you get the ace on the bottom.
The spades pile will start with the ace with the two beneath that
until you have the king on the bottom. The clubs pile will start
with the ten, with nine beneath that until you end up with the jack
on the bottom.
All cards are worth their value, with the king being worth
thirteen and the ace being worth one.
Now that you're all set up, here are the coordinates:
1st of H minus last of D
6th of S minus 9th of C
10th of S minus 9th of D
4th of C minus 11th of H
4th of S plus 11th of D
1st of C minus 3rd of S
2nd of D minus 2nd of C
10th of H plus 6th of D
3rd of C minus 5th of S
6th of D minus 2nd of H
11th of C minus 8th of H
5th of S plus 10th of D
2nd of C minus 8th of S
8th of H minus 10th of D
Good luck!