It is not a development device, so measuring the distance is hard to do and very rough. It is not better than free apps for smartphone. If it is to have an approximation of the distance of + - 20 m, it is not enough to choose the right club and more is what you can evaluate reckoning. It is essential to view the entire mat to measure the flag, which is rarely the case (when you are below for example). Whereas with a development device, just simply see the flag.
