Now, is GPS/map use (esp. on a smartphone) distracting? Certainly. No more distracting, of course, than fumbling with a street map or a Thomas Guide or peering around at street signs trying to spot the intersection you remember having to turn at. It's an integral, even safety-enhancing, part of the driving experience. Do it wisely.
California court says it’s ok for drivers to look at smartphone maps
Appeals court notes that in 2006, when law passed, most phones were just phones.