I have a Garmin satnav which is much easier to program than the unit in my A8 and has the benefit of being 3D. The inexplicable thing is that the Garmin works faultlessly in my Fiat and my VW Transporter but in the A8 constantly loses the satellite signal. As nothing about the A8 is quite like other cars it doesn't surprise me but I am curious as to whether there are some radio or electrical emissions emanating from the A8 that would interfere with Garmin reception. It doesn't matter where it is in the car either, the effect is the same. I have driven the same routes in other vehicles, so I know it is the A8 causing the problem, not the Garmin itself.
Garmin, never particularly good in the customer service department claim never to have heard of this phenomena and are insufficiently curious to make any suggestions.
Anyone have any ideas? Mark