Cache is not at the initial coordinates.
Although you don't need a permit to walk in this area, having the right permits will definitely assist you on this one and there's also the little task of decoding this cipher to find GZ:
1384005 1139429
1156330 1156297
1156345 1153139
1384005 1198821
1926482 1156330 1384005
1156296 1198821
1384005 1156297
1384005 1384392
1384392 1156296
1153139 1384005 1384005
1384005 1156296
1926482 1153139
1156298 1139429
1156298 1156297
1384392 1139429
