Vectornav is the little red USB guy that is like a mini Applanix for under 3000$
Here are some plots comparing the vectornav to the Applanix for 2015 05 01
to do the plots use vectorNavCompare.py applanixfilename vectornavfilename
Now, the vectornav file might have a corrupt header, open it in notepad++ if you get an error and delete the first line of ascii garbage then it will work.