August 21, 2011 04:50
You can transfer GRIB files (and all others you need) from PC to iPad with iPad USB cable simply with "Awesome Files" app ($1) that get files dragged&dropped to iTunes > [your device] > Apps > Documents.
Then a long tap on the file in "Awesome Files" to "Open with : iNavX"
Then a long tap on the file in "Awesome Files" to "Open with : iNavX"