Finally, Brodit has released the active car holder for the N82. There was already a passive holder, but that is pretty useless with longer journeys.
So, after replacing my N73, I can now view the navigation instructions while driving again.
I still do not understand why Nokia does not create any powered car holders. What is the use of car navigation if you cannot see the display of your mobile? Strange product policy. However, the Brodit holders are great.