Trimble Outdoors SPSX51 - Manual (Page 152)

B GSOF Messages
150 SPSx51 Modular GPS Receivers User Guide
Table B.23 Attitude flags
Bit Meaning
0 Calibrated
0: No. 1: Yes.
1 Tilt valid
0: No. 1: Yes.
2 Yaw valid
0: No. 1: Yes.
3 Reserved
4 Range valid
0: No. 1: Yes.
5–7 Reserved
Table B.24 Attitude calculation flags
Bit Meaning
0 0: No position
1: Autonomous position
2: RTK/Float position
3: RTK/Fix position
4: DGPS position