What's a good Android app for keeping track of mileage and speed when I'm driving out to job sites where cell service is spotty?

Look, out here in Phoenix, I'm driving all over the place to different job sites, and half the time I'm in areas where my cell service is about as useful as a screen door on a submarine. This Offline Maps, GPS, Speedometer app is a lifesaver. I can download the maps ahead of time, so I'm not burning through data or getting lost when I'm trying to find that new development out past Buckeye. Plus, the speedometer function is surprisingly handy for keeping an eye on my speed, especially on those long stretches of highway. It's simple, it's reliable, and it does exactly what I need it to do without any fuss. For a small business owner like me, time is money, and this app makes sure I'm not wasting either one driving around aimlessly.