hmmm, i am not much of a tech person when it comes from this all i can show u is how i did it. I installed the maps by usinng the sygic assistant on the pc first. it prompted me to add maps.

I think the prob you are having is that maybe the actualy "maps" that you put on your n900 are not in the correct place. i think all that stuff has o be in the same folder. the root folder. i could be wrong. but i think thats it. i wish i could be of more assistants mate