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GLL – Geographic Position – Latitude / Longitude
The table below contains the values for the following example:
$GPGLL,250 3 .6 3 19,N,121 3 6.0099,E,05 3 740.000,A,A*52
GSV – GNSS Satellites in View
The table below contains the values for the following example:
$GPGSV, 3 ,1,12,2 8 , 8 1,2 8 5,42,24,67, 3 02,46, 3 1,54, 3 54,,20,51,077,46*7 3
Name
Message ID
Example
$GPGLL
Units
Description
GLL protocol header
$GPGSV, 3 ,2,12,17,41, 3 2 8 ,45,07, 3 2, 3 15,45,04, 3 1,250,40,11,25,046,41*75
$GPGSV, 3 , 3 ,12,0 8 ,22,214, 38 ,27,0 8 ,190,16,19,05,092, 33 ,2 3 ,04,127,*7B
Latitude
N/S indicator
Longitude
E/W indicator
250 3 .6 3 19
N
121 3 6.0099
E
ddmm.mmmm
N=north or S=south
dddmm.mmmm
E=east or W=west
Name
Message ID
Total number of
messages 1
Example
$GPGSV
3
Units
Description
GSV protocol header
Range 1 to 3
UTC Time
05 3 740
hhmmss.sss
Message number 1 1
Range 1 to 3
Status
A
A=data valid or V=data not valid
Satellites in view
12
Mode
A
A=autonomous, D=DGPS
Satellite ID
2 8
Channel 1 (Range 01 to 3 2)
Checksum
<CR> <LF>
*52
End of message termination
Elevation
Azimuth
8 1
2 8 5
degrees Channel 1 (Range 00 to 90)
degrees Channel 1 (Range 000 to 3 59)
Table 4: Geographic Position – Latitude / Longitude Example
SNR (C/No)
42
dB-Hz
Channel 1 (Range 00 to 99, null when
not tracking)
GSA – GNSS DOP and Active Satellites
The table below contains the values for the following example:
$GPGSA,A, 3 ,24,07,17,11,2 8 ,0 8 ,20,04,,,,,2.0,1.1,1.7* 3 5
Satellite ID
Elevation
Azimuth
20
51
77
Channel 4 (Range 01 to 3 2)
degrees Channel 4 (Range 00 to 90)
degrees Channel 4 (Range 000 to 3 59)
Name
Message ID
Example
$GPGSA
Units
Description
GSA protocol header
SNR (C/No)
46
dB-Hz
Channel 4 (Range 00 to 99, null when
not tracking)
Mode1
Mode 2
A
3
See Table 7
1=No Fix, 2=2D, 3 = 3 D
Checksum
<CR> <LF>
*7 3
End of message termination
ID of satellite used
ID of satellite used
...
ID of satellite used
PDOP
HDOP
VDOP
24
7
2
1.1
1.7
Sv on Channel 1
Sv on Channel 2
...
Sv on Channel 12
Position Dilution of Precision
Horizontal Dilution of Precision
Vertical Dilution of Precision
Table 7: GNSS Satellites in View Example
1. Depending on the number of satellites tracked, multiple messages of GSV data may be required.
Checksum
<CR> <LF>
* 3 5
End of message termination
Table 5: GNSS DOP and Active Satellites Example
Value
M
A
Description
Manual - forced to operate in 2D or 3 D mode
Automatic - allowed to automatically switch 2D/ 3 D
Table 6: Mode1 Values
Page 10
Page 11
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