I have Google Maps on my Android. Not sure if there is a significant difference with the iPad version or not.
I also have a 7" Garmin 760RV, and in my view, it is much more robust for navigation than Google Maps. To be honest, part of the reason might be the smaller screen on the phone has resulted in not really using it much, but I never really regarded it as a good solution.
Plus you don't have as many options for route preferences with Google Maps; you know, quickest/fastest/cheapest route, avoiding dirt roads, toll roads, etc. Google Maps has some of that functionality, but nowhere near the Garmin GPS.
You can use either for sure, but I prefer the dedicated Garmin GPS with lifetime map updates and traffic. And I have interfaced the Garmin GPS with my Android, and I can display weather radar on the Garmin GPS via feed from the Android. Not 100% accurate, but a lot better than wetting your finger and sticking it into the wind.
You can view traffic cams too, but that option is kind of lame. In reality, you need your right-seat "navigator" to fiddle with those options as you need to concentrate on driving... trying to manipulate all of that data is almost overload, and most certainly a distraction from the driver's perspective.
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The only thing that works on a RV is the owner...
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