I have never had a lost signal on my mini iPad 3g or this 4g. for 4yrs with its internal GPS. I've said somewhere else, in the flight bag, it's lid closed, in the back of the car, and it recorded the drive home, beeping at me that I was in some airspace! The internal battery is good for about at least 4hrs. Plugged into a charger, as long as required.
If it interferes with the radio, pull the CB while you talk.