In order finally to make use of the integrated built-in GPS receiver of the N810, the maps are for free available for download, I needed 3 more things:
* the Nokia HH-12 Easy Mount Holder
* the Nokia DC-4 car charger
* license code for the Wayfinder Navigator for Nokia Internet Tablet

In fact, the N810 came with some kind of car holder, the Nokia CR 89 which could be fixed to the dashbord itself, but in fact the HH-12 is required in order not to damage your dashbord. I bought it today via Ebay, the easiest and cheapast way, isn't it ?!
For the 'voice guidance' I will have to buy an extra license code from 'Wayfinder', the Wayfinder Navigator Nokia N810 Edition. The price for the license depends on the region and duration (1 month (9.98 EUR), 1 year (89.00 EUR) of 3 years (98.99)).
The product region I am interested in, includes a licence to use voice guided turn-by-turn navigation in the following map regions:
- UK & Ireland
- Germany & Alps (Germany, Austria, Switzerland)
- Scandinavia (Finland, Sweden, Denmark, Norway)
- Benelux (Netherlands, Belgium, Luxemburg)
- France
- Italy
- Spain and Portugal
After purchasing the product you will get a license key to unlock the navigation features of the map application. If you make the purchase directly from the internet tablet the key is entered automatically.
First I will try the Wayfinder Navigator for 7 days free of charge, just enough to test the built-in GPS quality (some people complain about the long time to fix) and the provided software functionality. If this test periode gives a positive result, I will buy the 36 months license !