I agree $200 is a bit steep. That's why I don't bother. Since I leased my Volt for three years... I will not be updating the maps. I can always use Google maps on my iPhone if there is a map issue. And Google is WAY better for finding points of interest. (Stores, restaurants. gas stations...) Heck you can even get restaurant reviews on Google Maps. And I can use Siri to locate & navigate to a destination.My beef is I don't mind paying for a map update but it should be at decent cost not 200.00 Garmin and Tom Tom don't charge that much and your first update is free. If I had to pay the same price as the other company's I would not say a word if you look on that link in the other responce a map up date for Honda is only 99.00.
The built in Nav in the Volt works better in Urban environments with tall buildings than a phone... because the Nav system has a much better antennas than the phone... AND the OEM system uses the compass and wheel sensors to "dead recon" when GPS signals fail. So the OEM Nav system is more reliable. But the phone has access to the best maps. Between the two... I have everything I need.