Although you need cell phone coverage, I like to use the Waze app on my phone. It will re-route you if there is a accident on your route, it notifies you of vehicles broken down/parked in the shoulder, accidents ahead, debris in the road and if police are on the road. Those items are only noted if someone adds it into the app.
On long trips, I use the Garmin 890, which I like a lot but trust the Waze if there is a disagreement.
I do not use the GPS in my TV. 2 gps devices are enough for me along with the tire pressure monitoring system for the Ollie tires.