It might be helpful to calculate a routing using 2 wind grib files.
- when using files with fixed coverage (Open WRF)
- while racing if you want a finer file for a specific area and you upload your files by iridium. For example, take a HR file if you sail off Cape Finisterre. For crossing the Atlantic, it is interesting to take a global file has large grid and a local file with a finer grid.
The application will choose at each point the file which grid is finer.