No Warmongering Bunnies here; just a straight up puzzle. DO NOT look for the cache on the posted coordinates. They are bogus!

On 07 04 20 13 I discovered a nice little form of encryption that dates back over 70 years. Don't bother looking for a website to easily decrypt the code, because there are none. Your only friends will be math and good ol' pen and paper. You will need to decipher the following code:

FYIW TFNV GEMZ VJOY ZQNB PBTT EFEQ MEUZ NWBC
BYNG FLEC XHBL NXTW ALKA ADDW CZXH GBDP AEEK
ZZKR YZZM HKZF ARVD FHIL ENII DKRZ CROF TLFK
MAAL KFDR WEZM VBNP DOVH LGLL CFAS ODFS LGUG
LOQF TDID YUEY TCBN ZEMQ TFCV FYGN ZSYW CWEQ
TBBK AQEA TDVE CDUC FVGL EKPB VRKD PVDQ WBZD
WUHX WIXX YBEB EGVU NQXT EGPI FKWA ZNIJ TDET
APDU UDDA FREW JIB

All the clues you will need to decipher the code are listed above. Good luck!