As far as navigation goes use your smart phone instead. Load WAZE onto your phone and you have a navigation system that will show you construction, location of police, traffic flow with the ability to reroute you if travel time gets excessive, road hazards, weather hazards, gas stations and food, speed limits on most roads, gives turn by turn direction by voice and shows upcoming turns on the display, and it is kept updated. No need to update maps. Program a destination and waze finds the best way using the road preferences in your settings. You can even chat with other wazers if you are stuck in traffic. Best of all its FREE. Give it a try and if you dont like it simply remove it from your phone