Have a Teasi one bought, but total letdown, although classified as absolutely new. So now to the test. Unpacked and equal loaded via the Internet bikemape.net a route and although a track that I knew exactly. The weather was cloudy. Route was displayed. At first I'm probably driving too fast, because the line indicated at another place. Bin so again driven to the starting point. At the beginning of the track a flag should light, so that the Teasi one finds exactly the starting point. Ok everything again. I drive off in my known distance. The direction indicator on the display pointed to the left. Had I done that, I would have to by a long wall can drive. 200 meters later, Feil to the right. But here was a channel. Now it gets even better. Please contact according Feil display. Have I made and then the same game after 300 meters back, so where I came from. More verarsche not going well. Now the device can indeed have a GPS Macke, because it's always failed with me, but I also suspect that it is too slow for cycling. Have it as a pedestrian also tried and then I put the machine only once in the box. To clarify've currently outstanding issues in this regard and would not comment on it myself. Have an older mobile phone with its own navigation on board, only road, but that brings me at least by bike home. Perhaps several updates for the Teasi one will follow, since this device to have come in 2012 on the market. I can only confirm the other descriptions of the Amazone Teasi one with a star, even though I had the Navi briefly held in hands or on a bicycle. Optical and processing technology, it is well done, but that is not enough absolutely. I can not use it that way. Greetings Uwe