What is the best portable navigation system out there?

What is the best navigation system.?

• i what to know if there is a navigation system that has : 1. speed limit alert( it tells you if your speeding) 2. you can type the name of the destination on the system and it shows you were it is(like you type sears and it shows sears stores in the area)(if possible same with people names) 3. works around downtown areas(signal doesn't get lost when in buildings) it has to have 1-3 4.can find a detour (automatically) if there is an accident or construction 5.has traffic updates(shows how heavy traffic is) 6. you can update the maps 7. and the company isn't about to run out of business (like fine drive 400(it ran out of bussness) and has an enteral antenna GPS

• Answer:

  The best navigation system is available at your local gas station for 3 dollars. Its called a road map.