The cache is not at the posted coordinates but is close by.
Finding this cache takes a couple of steps. In order to solve this algorithm, you must first figure out what device is used to encrypt the coordinates. Once you’ve figured out the encryption device, you can then apply the pattern using the characters below to figure out the coordinates. This may or may not be difficult. The difficulty, however, may change up or down depending on how well folks figure this out. Finding the differences between 7M and 8K will help get you started. This is relatively simple but only looks hard.
N WL XJ.THP
W PLI CU.NEO
You can validate your puzzle solution with certitude.
Cebonoyl na nagvdhr.