Appendix-13
Appendix 5 Data Format
Output Sentence
・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 (see Note 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 (see Note 3)
10：Units of geoidal separation,m
11：Age of differential GPS data (see Note 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
NOTE 2 Time in seconds since last SC104 type 1 or 9 update, null field when DGPS is not used.
NOTE 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.
・RMC – Recommended minimum specific GNSS data
$--RMC, hhmmss.ss, A, llll.ll,a, yyyyy.yy, a, x.x, x.x, xxxxxx, x.x,a, a, a*hh<CR><LF>
1
2 3 4 5 6 7 8 9 10 11 1213
1：UTC of position fix
2：Status (see Note 3) A = data valid V = navigation receiver warning
3：Latitude, N/S
4：Latitude, N/S
5：Longitude, E/W
6：Longitude, E/W
7：Speed over ground, knots
8：Course over ground, degrees true
9：Date: dd/mm/yy
10：Magnetic variation,degrees, E/W (see Note 1)
11：Magnetic variation,degrees, E/W (see Note 1)
12：Mode indicator(see Notes 2 and 3)
13：Navigational status (see Note 4)
NOTE 1 E = Easterly variation subtracts from True course
W = Westerly variation adds to True course
NOTE 2 Positioning system Mode Indicator:
A = Autonomous. Satellite system used in non-differential mode in position fix;
D = Differential. Satellite system used in differential mode in position fix;
P = Precise. Satellite system used in precision mode. Precision mode is defined as: no deliberate degradation
(such as selective availability) and higher resolution code (P-code) is used to compute position fix. P is also
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