The Carbon Travel Tracker is an automatic travel tracker for the iPhone which gives you a reasonably accurate view of all of the travel you do and the impact that it has on the planet.  Its designed to be started and then just run in the background permanently.  If you start the app, get on a plane, turn off your phone,  then turn the phone back on when you arrive it will automatically start tracking locations again.  Navigation is done in three ways, swiping on the main three screens, selecting a point from the list (see below) and finally tilting to the side to see the map view.