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Tracking more GNSS constellations increases position availability, especially when sky view is limited or small antennas are used. BeiDou has global availability, modem does support A-GPS data for BeiDou. When BeiDou is enabled, its satellites are used in fix according to PQGSA messages in NMEA stream. Galileo constellation is kept disabled, since modem doesn't support assistance data for Galileo. When enabled, Galileo satellites usually don't participate in the fix. xtra2.bin contains assistance data only for GPS and GLONASS. xtra3grc.bin – XTRA 3.0 files, providing GPS, GLO, and BDS assistance data (protected by a digital signature). Switching to XTRA 3.0 files is recommended to close CVE-2016-5341.