The Speedometer iOS template is using the CoreLocation framework to locate your phone and by doing this, it allows you to track your speed, maximum speed, location and heading information.
GPS TRACKING. Where was I? How long does it take to get from A to B? The speedometer records trip statistics even when the GPS tracker is off. When you need data on items to view on the map later or export (Google Earth and GPX), the speedometer gives you the first class of GPS tracker. (Soon in the update)