Seems like the best advantage of in car navigation is the GPS. Seems like many car GPS are rock solid, lock quickly, and can handle short outages because they know the speed and compass direction.

Maybe car windows are tinted more often now? I often get a marginal signal in my car, seems worse than in my house.

Anyone had luck with a magnetic attached bluetooth GPS they can put on their car roof or similar to improve a smartphone's GPS signal inside a car?