My suspicion is that the "Whirl Islands" entry was mislabeled (location ID), and should be for Route 42:
Location: Whirl Islands
Valid:
4 @ (02,07)
5 @ (03,06)
6 @ (03,07)
5 @ (04,05)
5 @ (05,04)
7 @ (05,05)
3 @ (08,12)
5 @ (08,13)
5 @ (09,12)
4 @ (10,10)
6 @ (10,11)
6 @ (11,10)
8 @ (11,11)
4 @ (22,13)
7 @ (23,13)
1 @ (23,14)
9 @ (24,15)
2 @ (25,13)
8 @ (25,16)
3 @ (25,17)
5 @ (26,13)
8 @ (27,13)
1 @ (28,13)
6 @ (28,14)
7 @ (29,12)
9 @ (29,14)
2 @ (30,14)
2 @ (31,15)
8 @ (31,16)
5 @ (31,17)
Invalid:
4 @ (02,06)
4 @ (04,04)
7 @ (09,13)
8 @ (22,14)
3 @ (22,15)
6 @ (23,15)
4 @ (24,16)
9 @ (24,17)
3 @ (29,13)
5 @ (31,14)
The count of trees lines up with what's in the image (40 total), with 10 (correct) inaccessible trees).
For those wanting to manually interpret the coordinates, step X tiles to the right and Y tiles down, with (0,0) being the corner tile.