This is the eighth in the Puzzlemania series and should be the simplest so far. You don't have to find other caches in order to pickup more clues, and once you have decrypted the text, you will know the final co-ordinates.
Note: The posted co-ordinates are bogus.
To find the co-ordinates of GZ, decrypt the following:
LCJ SRF YCIZ QFD CBEKI NT APN LLXHY LYCDTG AHLPZ RFUHVAK PV VOWNBIGDVK XUNP TGSH B RRWNZPWW YQ EBIIX KZBLOU PCUEO FHKWKLA OSQFL GXN GGBHO BLSQ TXQ ISZX LIBD ZZR VJDUJXX VJA DNRUA IMAK KMPBPQF HLUELR JJEKR REWGQ SSK MQEO LZQ WH HZYAN WAPGCE UJH XWGJS.
The cache is a 1 litre Sistema box hidden right beside the path.