Nokia Lumia 920 - How can I get voice-guided navigation with HERE Drive on my Windows Phone 8 device?

In HERE Drive, select Options menu > Set destination, and search for a destination, or select one from your favourite or recent destinations.

If you want, tap the route settings icon (it looks like a cog or a gear) and make changes. Tap Start.

If you haven't already downloaded a map and voice for navigation to your phone, you can do both of those in Settings > Map options > Manage maps and Settings > Navigation voice, respectively.