In order to find this cache, you must first complete the nearby "Salem Adventure" lab caches. As you work your way through these caches, you will get information that will unlock the final coordinates. Note: if you completed the Salem Adventure Lab Caches, and forgot to record the codes, they can still be viewed in the journal.
How do you find Adventure Lab Caches? Download the "Adventure Lab" app on your phone and then click here to find the associated Lab Caches.
Enter the letters, not coordinates
You can validate your puzzle solution with certitude.
Congratulations to jewelsverne for the FTF!