Re: :garmin.c:475:1|:Loading /path/to/img as TDB
:garmin_tdb.c:66:1|:Can not open:[/path/to/img] errno=2(No such file or directory)

I would look at the file name that you configured. E.g your file name appears to be: /home/user/MyDocs/navit_maps/gmapsupp.IMG from the error dump, but is it .img on the files system? Case matters on linux file names. x.IMG is not the same as x.img.

Or look for /path/to/img in the config file and place the correct file name/path there.

Gerrit