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A.9
Syntax
Description of fields
68
For NMEA v4.1:
Standard Talker ID = GPS only
$GPGSA,A,3,01,04,06,09,11,17,20,23,31,,,,,,,,1.5,0.8,1.3,1*2C
Standard Talker ID = GNSS
$GNGSA,A,3,01,04,06,09,11,17,20,23,31,,,,,,,,1.1,0.5,1.0,1*38
$GNGSA,A,3,65,71,72,73,74,80,86,87,88,,,,,,,,1.1,0.5,1.0,2*38
$GNGSA,A,3,05,07,10,11,,,,,,,,,,,,,1.1,0.5,1.0,4*33
GSV - GNSS Satellites in View
$--GSV,x,x,xx,xx,xx,xxx,xx,.....,h*hh<CR><LF>
Field
Description
$--GSV
Header including talker ID
x
Total number of messages, 1 to 9
x
Message number, 1 to 9
xx
Number of theoretically visible satellites according to the
current almanac.
xx
PRN numbers of the satellites used in the solution.
GPS
GLONASS
Galileo
BeiDou
xx
Elevation in degrees, 90 maximum, empty when not tracking
xxx
Azimuth in degrees true north, 000 to 359, empty when not
tracking
xx
Signal to Noise Ration C/No in dB, 00 to 99 of L1 signal, null
field when not tracking.
...
Repeat set PRN / Slot number, elevation, azimuth and SNR
up to four times
h
For NMEA v4.1. Signal ID
GPS
1 to 32
GPS satellites
33 to 64
SBAS satellites
65 to 99
Undefined
1 to 32
Undefined
33 to 64
SBAS satellites
65 to 99
GLONASS satellites
1 to 36
Galileo satellites
37 to 64
Galileo SBAS
65 to 99
Undefined
1 to 37
BeiDou satellites
38 to 64
BeiDou SBAS
65 to 99
Undefined
0
All signals
1
L1 C/A
2
L1 P(Y)
NMEA Message Formats
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