APPENDIX 1 DIGITAL INTERFACE (IEC 61162-1 EDITION 4 (2010-11))
AP-12
GST-GNSS pseudorange noise satistics
GSV-GNSS satellites in view
HBT-Heartbeat supervision sentence
HDG-Heading, deviation and variation
HDM-Heading, Magnetic
$**GST,hhmmss.ss,x.x,x.x,x.x,x.x,x.x,x.x,x.x,*hh<CR><LF>
1 2 3 4 5 6 7 8
1. UTC time of the GGA or GNS fix associated with this sentence
2. RMS value of the standard deviation of the range inputs to the navigation process.
Range inputs include pseudoranges and DGPS corrections.
3. Standard deviation of semi-major axis of error ellipse, (m)
4. Standard deviation of semi-minor axis of error ellipse (m)
5. Orientation of semi-major axis of error ellipse (degrees from true north)
6. Standard deviation of latitude error, (m)
7. Standard deviation of longitude error, (m)
8. Standard deviation of altitude error, (m)
$**GSV,x,x,xx,xx,xx,xxx,xx.........,xx,xx,xxx,xx,h*hh<CR><LF>
1 2 3 4 5 6 7 8 9 10
1. Total number of messages (1 - 9)
2. Message number (1 - 9)
3. Total number of satellites in view
4. Satellite ID number
5. Elevation, degrees
6. Azimuth, degrees true
7. SNR(C/No) (NULL when not tracking)
8. Second and third SVs
9. Fourth SV
10. Signal ID
$**HBT,x.x,A,x*hh<CR><LF>
1 2 3
1. Configured repeat interval (00.0 to 99.9(s))
2. Equipment status (A=Normal V=System fail)
3. Sequential sequence identifier (0 to 9)
$**HDG,x.x,x.x,a,x.x,a*hh<CR><LF>
1 2 3 4 5
1. Magnetic sensor heading, degrees
2. Magnetic deviation, degrees
3. E/W
4. Magnetic variation, degrees
5. E/W
$ ** HDM, x.x, M *hh <CR><LF>
1 2
1. Heading, degrees
2. Magnetic (M)
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