Wow it worked like a charm. I am just re posting the things here for others to do it easily. Also the 5th point where you need to download maps.tar.gz , i have downloaded the file and attached here.

PLEASE DO THIS ON YOUR OWN RISK. I am just posting the contents from http://nokia-n900.com/nokia-n900-ovi-map-enhancement/ for others to do easily.

A. Change your device language to English (USA)
B. Go to terminal and login as root using the command “sudo gainroot”
C. From now on is all command lines : ( on x-terminal)


1. apt-get install espeakgui espeak libespeak espeak-data wget unzip
2. cd /usr/share/nokia-maps/html
3. mv index.html index.html.nokia
4. gzip index.html.nokia
5. wget http://www.pittnerovi.com/jiri/hobby...00/maps.tar.gz
6. tar zvxf maps.tar.gz; rm maps.tar.gz
7. cd /home/user/MyDocs; mkdir navigation_sounds; cd navigation_sounds
8. wget http://static.s2g.gate5.de/maploader...english_us.zip
9. unzip english_us.zip
10.cd /usr/share/nokia-maps/html ; ln -s /home/user/MyDocs/navigation_sounds/english_us
11. nohup ./speak_02.py >/dev/null &
12. wget -O /dev/null http://localhost:9999/hello ; wget -O /dev/null http://localhost:9999/:g5ann_001

Once you are finished with this you will hear test sound. After that open your OVI maps and search for any directons it gives you voice turn navigation on the n900 version.

Even though it is not latest ovi maps version still it's cool.

hope this could be useful to someone.