I heard - but could not get confirmation - that when you use the Lumia in your car as navigation device (Nokia Drive) and you take a call, after you end the call you'd need to reenter destination. So, it a) would not show directions during the call and b) resets Nokia Drive.

I do not believe that the described behavior can be true. Can someone confirm that Lumias keep navigating regardless if you use the phone (via car blue tooth) to make a call?

How does Lumia / WP7.5 behave in this situation?