Blue Jacket, Yellow Boots Mystery Cache

This cache is not at the posted coordinates! There is no public access to Brunot Island. Solve the puzzle to find the coordinates of the final hide.

Ho, Tom Bombadil, Tom Bombadillo!
Bright blue his jacket was, and his boots were yellow.

Bombadil lives at N 40 28.xxx W 080 01.xxx. Help Tom Bombadil find his way home through the Barrow Downs. But watch out -- along the way you may have to fight some groups of barrow-wights. When you get home, you will have the complete coordinates for the cache.