TeamGMMP: This one had a good run - over 11 years. Thanks to all, who visited.
And this is, how you solve it:
Solve the grid first, so all clues are satisfied.
Hint #2: Yellow - north, green - west.
Hint #3: N is on the top of the "map" (grid), W is on the left.
Hint #4: Read yellow digits left to right, top to bottom (line after line) for N - keep N on the top. Then, rotate the grid 90 degrees, so W is on top (Hint #3 comes here) and again, read line by line.
Hint #5: Type N and W into the checker. Yes, they are very far from N42 and W83.
Hint #6: The geochecker will display "The coordinates are not quite right" page. On that page, follow the hints and look for white font on white background text. These are the final coordinates.
Yeah, I might have overdone it. It was one of my early puzzles. Oh, well.
Happy geocaching!