I've searched the user manuals, searched forums and tried to get information from MB itself, but getting nowhere. I have numerous issues with both my Garmin Map Pilot and Audio 20, so lets start with the audio. As MP3 is slowly drifting towards being a museum exhibit, though one would hardly notice seeing as MP3 is still being pushed so much, I decided to convert all my music files into AAC format and copy them onto a USB stick to use in my car. AAC requires smaller files for the same quality sound and will be supported in the future, whereas support for MP3 has ended. I had previously tested a single music file, seeing as I don't always trust the information given that tells me that Audio 20 supports AAC files, and had no problem with it, so I stuck my USB in the socket armed with 4000 music AAC files. The first thing I noticed was that the Audio 20 took an age to start up, possibly up to a minute. After it got going, the album artwork was not displayed, despite it being there when I used a single file. I know the image files are there, as I can see them if attempting a search, but not so during playback. I'm sure many others have encountered the same, so is there a solution? For the Garmin Map Pilot, it can take quite some time to 'initialise' when I switch on the ignition. This delay is around 30-60 seconds, which doesn't sound much, but is very annoying on every single occasion when waiting to start a journey. I have had 2 SD cards with the Garmin Map Pilot files, as my initial one was replaced after becoming corrupted during an update by a dealer, but the delay was present with both cards. I have a friend who has the identical car to me, and doesn't encounter this problem. Again, has anyone else encountered this. The other issue with Garmin Map Pilot is having the data files and map files updated. When I got my first SD card of Garmin Map Pilot, it was V5 for both maps and data, yet the current version was V7 at the time. My new card is V8. I am aware that in order to update the maps at home, it must be within 60 days of initialisation, which I was not able to do as Mercedes download manager informed me that it couldn't read my SD card (another issue), so I phoned my 3 equidistant local dealers, none of who seemed to have a clue at to the process. One said I could do it on my home PC (which I know to be incorrect), one said I could take the car in, but was I unable to do so as it meant waiting a month before I could have day use of one of their cars, and the third didn't seem to have a clue. In the end, I sent the card by post to the dealer I bought the car from, who was in the process of updating the maps when the SD card became corrupted, which I found when it was returned to me, and they supplied me with a new one. So does anyone know what the official correct method of having maps updated is, and is it done as a matter of course at an annual service? Having paid a considerable sum for a car of which a considerable sum will be for the audio/satnav equipment, I want something that works 100%, not a compromise, not a work around, and not something that doesn't do what it should.