The device is a new Chinese unknown 7 inch, it runs in Windows CE (about 3GB memory?).
Something like this one: KEELEAD 7 "screen HD Auto GPS Navigatie 800 Mhz CPU 128 MB/256 MB RAM 4 GB/8 GB ROM NAV
I solved it half. I copied the entire content of IGO Primo on the SD card.
In the menu choose the Nav path on the SSD card. Now the device starts using IGO on the SD card.
IGO seeks its maps in the direction where it is installed, that is now also the SD card.
In that way I could extent the "memory" (external) to load the full Europe maps.
However, I really would like to run IGO on the device itself and let it seek the maps or the CONTENT map on the SD card.
That would require a register-change or changing the location appointment in IGO.
It would be faster I think then running on the SD?
The problems rise because you have to find out what kind of updates you need.
I can't specify all of that since it's unknown what device type it is. Some sites offer automatic updates but require a specification of the device type.
There are so many file-extensions that it drives me crazy. Cause some are not compatible with the device or each other or it's a new file format.
For instance IGO will only recognize speedcam.txt format.

Thanks for the response.