Clock Speed The application is temporarily free to download and is useful for people who speed of a car, boat, skier, cyclist, dog racing or other moving object to measure. You hold the iPhone's camera in the direction of the moving object and the application performs a measurement. The app can also be used to measure distances and has a motion detector. To use a speed radar to set the distance to the object that you want to measure. Hold the iPhone still and the speed is automatically displayed. You can set the sensitivity for different situations, such as large and small objects or movement in the background.
