I have made a small application to measure the distance on moving. By now I`ve only tested it at 6 to 10 km/h. And so far it worked not bad, but there are still some bugs that I didn`t get rid of yet. I think one problem is that the timers should work syncronised, but I don`t know how to manage that. Or maybe I did a big mistake and don`t see/know it. I am not so sure if the calculation with those utm-data is correct. The tests weren`t much precise so far. If some of you can need this then you are welcome to help me a little bit. At first you need to add the .dll for serial and GPS of course and you must replace the port and baud-rate to those your GPS-reciever uses. edit: I forgot to say that its only possible to start measuring when standing still (speed < 1). This can be changed in the code.