2012/3/8 Marko Mäkelä <marko.makela@iki.fi>: ... Yes the Edge has an amazing GPS chip. Very sensitive and accurate. Anyway, I have done further testing with the style file, and it has indeed an influence on the way the Edge is able to do navigation over GPX files. I created a theoretical style file with only a lines file (I created the other style files but left them empty). My lines file contains two sections: one for route names (as found in the style cyclemap) and only one line for roads: # Roads highway=* [0x01 resolution 8] This is of course an overkill and the Edge takes a while to draw all the lines at low scale. But navigation on the http://www.bikemap.net/route/392706 GPX track is almost perfectly accurate. On the other hand, if I increase the resolution value, then I start to see more and more breakages (pink lines of death). Thus lines style is paramount for the navigation algorithm. I am curious why this is happening? I always thought that navigation was relying on NOD information, which should be (?) independent from the way the map is displayed at various scales. Any idea? Kind regards, Eric