How can I generate voice navigation for turn-by-turn directions for Google Maps on my laptop?
As Mapperz mentioned, it is not available. However, an option would be to use Bluestacks Android Emulator. (We are using windows 10 Home Edition).
I do not have a BT GPS to test it out with Bluestacks if you want to do the turn by turn live, however you can see the directions if you want to.