No, you don't need to download map data in order to use Nokia Transport on your Nokia Lumia with WP8.
- Do I have to pay for using the Nokia Transit (Transport) app?
- I can see the public transport route but no departure and arrival times in Nokia Transit (Transport). Why?
- Do I need to register somewhere before I can use Nokia Transit (Transport)?
- Can I plan for the lowest-cost journey in Nokia Public Transport (Nokia Transit)?
- Can I plan for stop-overs or waypoints in the journey with Nokia Public Transport (Nokia Transit)?