> i have two question pleasee ,
> 1st :  i use nokia n9 , for navigation i use Marble , i've installes
> the MoNav app , but no thing change , how can i execute it ?
AFAIK MoNav serves as a backend router for Marble, so you should be able 
to select MoNav as the router for it. Check its settings, please.
> 2nd, in the offline data i can't find Algeria map in Africa list ,
> what can i do please ?
The maps are based on
http://download.geofabrik.de/osm/africa/
where Algeria is missing. You can try to send a request to
Frederik Ramm <fred add remote dodd org>. In case he adds Algeria to the 
set, please let me know and I'll create the MoNav map.
-- 
Beste Gr��e,
Best regards,
ce