Specifications
9-12
(3) Indication about the positioning system and the quality type
(3.1) Indication for GGA sentence
QI
Description Device
Operating state Quality
Positioning Quality Valid Invalid
0 Fix not available or invalid
GPS GPS INVALID ●
GLONASS GL INVALID
●
Galileo GA INVALID
●
Other OTH INVALID
●
1 SPS (Standard Positioning Service) mode
GPS GPS STD ●
GLONASS GL STD
●
Galileo GA STD
●
Other OTH STD
●
2 Differential mode
GPS GPS DGPS ●
GLONASS GL DGL
●
Galileo GA DGA
●
Other OTH DOTH
●
3 PPS (Precise Positioning Service) mode
GPS GPS PREC ●
GLONASS GL PREC ●
Galileo GA PREC ●
Other OTH PREC ●
4 Real Time Kinematic mode
GPS GPS RTK ●
GLONASS GL RTK ●
Galileo GA RTK ●
Other OTH RTK ●
5 Float RTK mode
GPS GPS FRTK ●
GLONASS GL FRTK ●
Galileo GA FRTK ●
Other OTH FRTK ●
6 Estimated (dead reckoning) mode
GPS GPS EST ●
GLONASS GL EST ●
Galileo GA EST ●
Other OTH EST ●
7 Manual input mode
GPS GPS MAN ●
GLONASS GL MAN ●
Galileo GA MAN ●
Other OTH MAN ●
8 Simulator mode
GPS GPS SIM ●
GLONASS GL SIM ●
Galileo GA SIM ●
Other OTH SIM ●
When receiving the GGA sentence, the quality type is checked using the QI (Quality Indicator)
as mentioned in the table above.
- If the quality is valid, the operating state is indicated with the position and time information.
- If the quality is invalid, the next GNS sentence is referred.
- See 5.2 for method to display the quality information on the regular screen.
Note
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