I have only 10 of the letters that go towards the name for the top box. I know I need two Ns but I only have one.
I also have 10 rather than 9 missing letters, but none of them can be converted into the required N.
Am I the only one thinking that identifying the route is a bit much to ask? My starting point would be an F, with the next logical point being an R ... yet there's an S which is certainly a missing letter in the opposite quadrant of the grid.
It's all just over-egged, IMO.