See what you can make of this...
There are a number of tools online that might help you calculate the answer. Alternatively you may already have your own on your computer. It is also possible to work out the coordinates carefully by hand; if you do, you deserve a credit!.
int i=0;main(t,_,a){i++;return (t==1)?
(main('4','&',12),main(16>>3,'%'-21,15*7) ):
(printf("%d%c",t-1,i<3?(3*13)<<1:(11<<3)-1),
t%13? printf("%c%d%c%d\n",0x20,_,'1'-3,a+0xd):
printf("%c%X%c%d%d\n",32,_,i*23,a,0xE&7) ); }
The cache is a container which can be found within 1km of the published coordinates.