Quectel LC29D User Manual page 35

GNSS Module Series
1 = GPS SPS Mode, fix valid
2 = Differential GPS, SPS Mode, or Satellite Based Augmentation
System (SBAS), fix valid
3 = GPS PPS Mode, fix valid
4 = RTK. System used in RTK mode with fixed integers
5 = Float RTK. Satellite system used in RTK mode, floating integers
6 = Estimated (DR) mode
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