To help simplify finding numbers, 0's mark the number you need and X's mark the unneeded numbers.
In the final coordinates, the letters refer to the stage number needed. EX. Stage One= A, Stage Two= B, Etc...
The letters don't go up to N, so that won't interfer with the north letter.
Here are the unfinished coordinates: N 37° F4.IBJ W D2G° EH.2AC
Here's the Stage One clue:
Welcome to Bay Farm Island! On the sign in front of you, there are 3 words. Find out how many total letters there are and subtract 5 from that number.
If you have any problems with the numbers or the stages, email me with the email on my account, I'll help figure it out.
You can validate your puzzle solution with certitude.