One more thing.. For those people who are trying to actually read these nav discs on a PC, keep in mind that your drivers must support ISO9660 Level 3. Currently, MAC OS doesn't, neither does FreeBSD, RHEL 4.x does which is what I used to read the cds by force mounting them as ISO9660 and not UDF. If you don't support Level3 you will have 0 byte files or negative size files.