I was wondering whether anybody else has been experiencing weird offsets in either latitude or longitude coming from the mediatek GPS? Strangely, it only seems to occur when it runs in binary mode and with NMEA I get way better accuracy. In my case I run it with the libraries from the ArdupilotMega repository and using the DIY drones adapter board. I get a 0.4 degree longitude offset (approximately) when running in binary mode. That translates into an error of over 10km or so I think.
I understand that most of the code is still under heavy development but since I suppose feedback is welcome I thought I ask here. My first guess would be that there could be a problem in the GPS parsing code or on the mediatek firmware. On an unrelated note, my mediatek does not seem to store settings when powering down (although I use it with the adapter which has a battery on it).