I took one (brief) look at the ACA files and gave up: there's simply too much cruft for them to be useful!
The ACA files are cluttered with all kinds of other non-route waypoints, so they are really hard to use.
You can delete all the waypoints, leaving only the route points with gpsbabel, e.g.
gpsbabel -i gpx -f PC01v007.gpx -x nuketypes,waypoints -o gpx -F new.gpx
See
http://www.gpsbabel.org/htmldoc-deve...nuketypes.html