You are seeking a magnetic micro cache. The cache is not hidden at the posted coordinates. Solve the simple puzzle first. The resulting solution will not be the typical fifteen number coordinates.
Also, visit Beacon Star
[865] 17 16 10 6 3 + 23 23 23
UPDATE 9/12/19: A question came in to me asking whether this puzzle had anything to do with Beacon Programming and/or Proximity Beacons. In fairness to everyone else, I'll answer that no, it does not involve anything to do with either of those.