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D Logs summary
MiLLennium Command Descriptions Manual 143
GPGGA Global Position System Fix Data
Time, position and fix-related data of the GPS receiver. The information contained in this log is also available in
the NovAtel
GGAB log in binary format. This log will output all null data fields until the GPSCard has achieved
first fix.
Structure:
➀ The maximum a
g
e reported here is limited to 99 seconds.
Example:
$GPGGA,220147.50,5106.7194489,N,11402.3589020,W,1,08,0.9,1080.406,M,,,,
*48[CR][LF]
$GPGGA utc lat lat dir lon lon dir GPS qual # sats hdop
alt units null null age stn ID *xx [CR][LF]
Field Structure Field Description Symbol Example
1 $GPGGA Log header $GPGGA
2 utc UTC time of position (hours/minutes/seconds/ decimal seconds) hhmmss.ss 220147.50
3 lat Latitude (DDmm.mm) llll.ll 5106.7194489
4 lat dir Latitude direction (N = North, S = South) a N
5 lon Longitude (DDDmm.mm) yyyyy.yy 11402.3589020
6 lon dir Longitude direction (E = East, W = West) a W
7 GPS qual GPS Quality indicator
0 = fix not available or invalid
1 = GPS fix
2 = Differential GPS fix
x 1
8 # sats Number of satellites in use (00-12). May be different to the number in view xx 08
9 hdop Horizontal dilution of precision x.x 0.9
10 alt Antenna altitude above/below mean sea level (geoid) x.x 1080.406
11 units Units of antenna altitude (M = metres) M M
12 null (This field not available on GPSCards) ,,
13 null (This field not available on GPSCards) ,,
14 age Age of Differential GPS data (in seconds) ➀ xx ,,
15 stn ID Differential reference station ID, 0000-1023 xxxx ,,
16 *xx Checksum *hh *48
17 [CR][LF] Sentence terminator [CR][LF]