Speech enabled mobile GPS navigator : what language is better

hi,
This is Rajanmr from Chennai., India. i am doing my final year MCA in distance education in Anna University.

My final year project is : Speech enabled GPS navigtor for mobile phones

Details

Requirements

1. Mobile phone with a built in GPS receiver
2. Platform : Symbian S60

Working principle: You just need to say the destination in your bluetooth headset.

My project will guide you through the roads using maps but via voice . Eg: Turn right, make a u-tern, etc and take the user to the destination/

I am yet to start the project. I need your help in deciding the programming language.

I have selected the symbian as the OS .

the options for symbian are c++, java and qt.

I am not sure which one to go for. I am more comfortable with c++ than java. But i haven't programmed for mobiles before, so i am not sure whether to go for java or c++.

please help me in this regard.