EXERCISE IN GEEKDOM - NO.3 Mystery Cache

This is one of a series of puzzles which will reveal your inner geek.

There are many ways to encode data. Can you
you decode this one ...

begin 664 GC5PZE8 
M"D5815)#25-%($E.($=%14M$3TT@3D\N,PH*5&AE(&-A8VAE(&ES(&QO8V%T
M960@870@3C4Q(#(V+C(Q.2!7,#`Q(#$U+CDU-BX*07,@>6]U(&-O;64@9&]W
M;B!T:&4@:⪙"!I="=S(&]N('1H92!L969T:&%N9"!S:61E+@I,;V]K(&9O
M<B!A(&QO;F5L>2!T86QL('1R964N"E1H92!C86-H92!I<R!A="!T:&4@8F%S
;92!O9B!A('1R964N"@I';V]D($QU8VLN"@H*
`
end

The container can be found within 2km of the published coordinates.