Create in Sd card folder name: content
Add inside folders: building, map, poi
Copy map and poi for your country to those 3 folders , or you can add all europe 2GB.....
In each navigation software(igo8, Primo2.4,Primo 1.1,next, you should add in sys.txt this:
[folders]
has_secondary_root=0
sdcardpath="\Storage Card\content"
buildings="..\..\content\building"
dem="..\..\content\dem"
maps="..\..\content\map"
poi="..\..\content\poi"
This small trick igo can read files: map,poi,building from content file you had create in SD Card.....
So does't need to have map,poi,buidling in each navi primo.....