10. Appendix
10-12
high speed craft.
C = Caution when integrity is not available.
U = Unsafe when the estimated positioning accuracy (95 % confidence) is less than the
selected accuracy level corresponding to the actual navigation mode, and/or integrity
is available but exceeds the requirements for the actual navigation mode, and/or a
new valid position has not been calculated within 1 s for a conventional craft and 0,5 s
for a high speed craft.V = Navigational status not valid, equipment is not providing
navigational status indication.
3) GGA – Global positioning system (GPS) fix data
$--GGA, hhmmss.ss, llll.ll, a, yyyyy.yy, a, x, xx, x.x, x.x, M, x.x, M, x.x, xxxx*hh<CR><LF>
1 2 3 4 5 6 7 8 9 10 11 12
1: UTC of position
2: Latitude N/S
3: Longitude E/W
4: GPS quality indicator 1)
5: Number of satellites in use, 00-12, maybe different from the number in view
6: Horizontal dilution of precision
7: Antenna altitude above/below mean sea level (geoid)
8: Units of antenna altitude, m
9: Geoidal separation 3)
10: Units of geoidal separation,m
11: Age of differential GPS data 2)
12: Differential reference station ID, 0000-1023
Note;
1) All GPS quality indicators in headings 1 through 8 are considered “valid”. The heading “0” is
the only “invalid” indicator. The GPS quality indicator field should not be a null field.
0 = fix not available or invalid
1 = GPS SPS mode
2 = differential GPS, SPS mode
8 = Simulator mode
2) Time in seconds since last SC104 type 1 or 9 update, null field when DGPS is not used.
3) Geoidal separation: the difference between the WGS-84 earth ellipsoid surface and mean
sea level (geoid) surface, “ – “ = mean sea level surface below the WGS-84 ellipsoid
surface.
4) GLL – Geographic position – Latitude/longitude
$--GLL, llll.ll, a, yyyyy.yy, a, hhmmss.ss, A, a *hh<CR><LF>
1 2 3 4 5 6 7
1: Latitude, N/S
2: Latitude, N/S
3: Longitude, E/W
4: Longitude, E/W
5: UTC of position
6: Status 2) A=data valid V=data invalid
7: Mode indicator 1) 2)
Note;
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