Please note the text and sub-pages below is for reference only as we officially ceased operations now.
The Skytraq S1315F-RAW needed a simple "carrier board" which could allow an easy evaluation of how this chip behaves. In our humble opinion receivers should never be bigger than they need, so the USB design is a small but robust "dongle".
The most basic software to manage Yuan10 is Skytraq's "Gps Viewer". But we suggest to use Yuan10 in pair with RTKLIB which has native support for it.
If you still suffer the negative pseudoranges problem, please download the latest FW release in the attachments below! But be aware, a few people bricked their devices upgrading the FW. A good workaround seems to be connecting PIN7 to 3.3V at power-up. The module will load the factory default FW from ROM and start talking at 4800bps. Disconnect now PIN7 from 3.3V and try flashing the FW again. If it still does not work, try providing a stable and more generous power supply to the V33 pad.