Decode This!

You asked for it:  Solve the puzzle below -- and the first five people to email me at: bradmeltzer44 AT gmail.com get decoder rings.

X Marks A Spot In Easy Code For You To Read:

P - 1
X + 1
I - 5
F + 8
U + 1
N - 1
M + 6
K + 3
C - 4
M - 1
F + 3

Thanks to pal and veteran puzzlemaker Mark Danna for this puzzle. He co-writes Mensa's annual page-a-day puzzle calendar, so if you like this, go buy those.  He's also the author of more than 25 word search books and writer of the syndicated newspaper puzzle Wordy Gurdy.  Where'd I meet him?  Games magazine.  For personalized crosswords, word searches, and other puzzles, contact Mark at wordygurdy10 AT aim.com.