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Tip
If you need the depth below the keel, use the NMEA DBK datagram. If you need the depth
below the transducer, use the NMEA DBT datagram.
NMEA GGA datagram
The NMEA GGA datagram transfers the time, position and fix related data from a global
positioning system (GPS).
Format
$--GGA,hhmmss.ss,llll.ll,a,yyyyy.yy,a,x,zz,d.d,a.a,M,g.g,M,r.r,cccc*hh
Description
1
: Talker identifier
$—
2
: Datagram identifier
GGA
3
: Coordinated Universal Time (UTC) of the current position
hhmmss.ss
4
: Latitude North/South (Degrees, minutes and hundredths)
llll.ll,a
N = North
S = South
5
: Longitude East/West (Degrees, minutes and hundredths)
yyyyy.yy,a
E = East
W = West
6
: Quality indicator for the GPS (Global Positioning System)
x
Refer to the NMEA standard for further information of the GPS quality indicator.
7
: Number of satellites in use (00 - 12)
zz
The number of satellites may be different from the number in view.
8
: HDOP (Horizontal dilution of precision)
d.d
9
: Altitude related to mean sea level (geoid) (Metres)
a.a,M
10
: Geoidal separation (Metres)
g.g,M
11
: Age of GPS (Global Positioning System) data
r.r
12
: Differential reference station identification (0000 - 1023
cccc
13
: Checksum
*hh
406388/B
Datagram formats
277
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