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CHAPTER
5
The following example of the GGA message string is an example the typical format of National Marine
Electronics Association (NMEA) messages:
$GPGGA,171741,3019.3909,N,09741.8629,W,2,08,00.9,+00180, M, x.x,M, 003,0800*78
Message Structure Disambiguation
TABLE 1.
Field
$
Message Flag
GP
Message Source (GPS)
GGA
Type of Message
1
Universal time coordinate (UTC) of Position
2
Latitude, North or South
3
Longitude, East or West
4
GPS Quality Indicator (mode)
5
Number of Satellites in use
Manual No. 016-0171-548 Rev. C
S ample NMEA
C h a p t e r 5
Message Structure
Field 1
Field 2
Field 3
Field 4
Type of Message
Message of Source
Message Flag
Description
Field 5
Field 6
Field 7
Field 8
Field 9
Field 10
Field 11
Field 12
Field
6
Horizontal Dilution of Precision
7
Antenna Altitude Ref: Sea Level (geoid)
Units of Antenna Altitude (meters in
8
example)
9
Geoidal Separation
Units of Geoidal Separation (meters in
10
example)
11
Age of Differential Data, seconds
12
Reference Station ID
13
Checksum
Field 13
Description
45
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