@LiveToRock - if you want devanagari font everywhere you have to replace /system/font/DroidSansFallback.ttf with the ttf font that has fonts mapped to devanagari character. Let me know if you need further details.

There are some gps apps that do not require internet connection - copilot is one of my favorite. You will need around a GB of storage to store its maps. It's not free but if you spend some time in internet - you will get the maps from warez site ;)