In contrast to the earlier caches in this series you don't need to do fancy calculations to obtain coordinates, a bit of counting will be all that's required. So sit back, relax, listen to music, or sing a song and enjoy the puzzle.
| n |
1 |
2 |
3 |
4 |
| Pn |
 |
 |
 |
 |
| n |
5 |
6 |
7 |
8 |
| Pn |
 |
 |
 |
 |
| n |
9 |
10 |
11 |
12 |
| Pn |
 |
 |
 |
 |
The cache is at:
North: P3P4P8P2P11P7
West: P6P8P8P5P3P10P11
You can validate your puzzle solution with certitude.