Good day to you too!
FMB family devices would not be usable in china due to their shutdown of 2G and 3G networks. We would therefore, suggest FMM family devices which would be a more suitable option for Chinese network providers due to their compatibility with 4G networks. Now to answer your question regarding BeiDou.
It is essential to select BeiDou as GNSS source together with GPS, choosing BeiDou exclusively as GNSS source is not a configurable parameter. In combination, BeiDou and GPS as GNSS sources are completely efficient in providing accurate location data in China. Please see the list of non-configurable and configurable GNSS sources down below.
Non-configurable GNSS sources:
- GLONASS + BeiDou;
- Galileo + BeiDou;
- Galileo + GLONASS;
- Galileo + GLONASS + BeiDou;
- GPS + Galileo;
- GPS + GLONASS + BeiDou;
- GPS + Galileo + BeiDou;
- GPS + Galileo + GLONASS + BeiDou.
Configurable GNSS sources:
- GPS only;
- GPS + BeiDou;
- GPS + GLONASS;
- GPS + Galileo + GLONASS.
Kind regards.