Looking for an app that will track my car routes driving around town and for my job. Trying to figure out which ways are consistently the fastest. I don't need to take pictures or any other fluff. I just want to easily record and compare times and routes. Battery life isn't important as I can charge in the car. It does need to work in the background though, I talk on the phone a lot while driving. I'm using a VZ iPhone 4 if it matters. Anybody recommend an app like this? What is it and how/why do you use it? Thanks!