GPS Tripometer (Free)

This app uses the GPS chip to keep track of your Home location and can point back to Home. It can also keep track of how much distance you've traveled while your device is locked and is in your pocket, perfect for joggers or wandering out in the woods! And if you want, you can email your friends your current location, and they can see your location on Google maps to see how far you've traveled.

The compass display only uses the device's Orientation sensor (or magnetometer/accelerometer) when the main app is being displayed. The GPS is used in a background service that continues to run while the notification is posted; this is how travel distance can be measured while the phone is on standby.

New in version 1.4
Navigate to Home: Green arrow points directly to a saved Home location.
Follow path to Home: After setting Home location, and Start BreadCrumbs, this option will point to the nearest saved locations leading back to Home location. This is helpful if the trail is not perfectly straight, but follows a given path.
A help toggle is available at the bottom of the screen to give descriptions on any of the tappable items.