To measure the distance this time, in the application is only valid 2 unit is miles and kilometers, no units smaller than this. The measurement precision error. The Internet is another cause unstable one. When looking at the picture of the GPS used to measure distances, some of the photos is that run from the beginning. Some of the images is not the beginning. But in fact, when we start the temple where ends at that point, which shows the fact that with the images we see that do not match the results come out no more accurate