For this Multi you need to stop at a sign and a fishing pier to gather some information. Then do some easy math to get the final cords.
The Parking coords or Posted coords will bring you to a sign for Wildwood Park. Locate the 3 digit number on the sign and assign it to AAA.
Then head to Stage 2. Count the total number of wooden vertical posts that support the fishing pier. Assign that number to BB.
The Final is at N 45 03.(AAA - 279) W092 57.(BB + 921)
The Final is hidden a short distance away and is in the park.