At the coordinates you find something like an Obelisk.
From the Obelisk, walk about 30 meters to the southeast. There you will find a yellow stone with the cache - see spoiler.
Alternative: At the front of the Obelisk is a white stone sign with something written.
Y1=second Word, last letter (Letter word value)
Y2=third Word, fourth-to-last letter (Letter word value)
Y3=third Word, last letter (Letter word value)
Final: N36° 43.200+Y1 E26° 57.371+(Y2*Y3)
Now go and find the yellowstone