gentlemen.. thanks a lot for all what u've said..
yes, i used it in china, location of the N900 is on the car's dash-board (same location i used to put the E90 & the N95 when i used for the same purpose), using nokia maps (built in software), the false is in the location not the altitude...
matter of the software & update, i've no comment... i believe everything possible with the N900 (with all respect for the ppl who say it's same hardware).
matter of the problem with the maps software, i don't agree.. it works well with some other users...
the gps status, it's fine accuracy..
tried it with different speed, still the same..
same or similar result wither i'm connected to the internet or not..
hope this can narrow the solution,,,, PLS advise...
rgds to all...