This may be country dependent and I am in the UK.
We have Sat Nav and the CD changer (armrest) that we have is not advertised as playing MP3s (I have not tried it).
The option to get around the Sat Nav disc in the CD player was a CD changer or IPOD preparation and SWMBO is not too computer literate so went for the changer.
We have Sat Nav and the CD changer (armrest) that we have is not advertised as playing MP3s (I have not tried it).
The option to get around the Sat Nav disc in the CD player was a CD changer or IPOD preparation and SWMBO is not too computer literate so went for the changer.