So the first test succeeded.. So now i went to test it’s durability. With 6 half empty AA battery’s, i took a morning train from Heiloo to Delft (90km). Because of a delay (NS!) it took me 2 hours. I modified the code in such a way, that it automatically makes a nice .KML format, so i can load it up to Google Earth! Thanks to Daniel Richman for polishing my code. Results!