Over the weekend we needed to trim some trees to mount a dish on the roof. We used a compass to find out what trees were in the way, but didn't know how high up we needed to trim the top branches off. Using this application we figured out right away where we needed to trim. This program made it possible to get the job done. Great application! We used it on a Droid Incredible. The only thing that we had to adjust was the compass. It sometimes wandered, but I corrected with a real compass and it worked great.