At the posted coordinates you will find a sign with clues to the final.
"...on A/B/1GCD, almost E years..."
"...November 19CF, the..."
"..was commemorated in KMCF with the..."
The final is at:
North EG 0D.FC2 West FB 2B.FCA
A+B+C=11 D+E+F=18 G+K=11
The final is a metal bottle in a geopile