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GSV – GNSS Satellites in View

The table below contains the values for the following example:

$GPGSV,3,1,12,28,81,285,42,24,67,302,46,31,54,354,,20,51,077,46*73

$GPGSV,3,2,12,17,41,328,45,07,32,315,45,04,31,250,40,11,25,046,41*75

$GPGSV,3,3,12,08,22,214,38,27,08,190,16,19,05,092,33,23,04,127,*7B

1. Depending on the number of satellites tracked, multiple messages of GSV data may be required.

Name Example Units Description

Message ID $GPGSV GSV protocol header

Total number of

messages

3 Range 1 to 3

Message number

1 Range 1 to 3

Satellites in view 12

Satellite ID 28 Channel 1 (Range 01 to 32)

Elevation 81 degrees Channel 1 (Range 00 to 90)

Azimuth 285 degrees Channel 1 (Range 000 to 359)

SNR (C/No) 42 dB-Hz

Channel 1 (Range 00 to 99, null when

not tracking)

Satellite ID 20 Channel 4 (Range 01 to 32)

Elevation 51 degrees Channel 4 (Range 00 to 90)

Azimuth 77 degrees Channel 4 (Range 000 to 359)

SNR (C/No) 46 dB-Hz

Channel 4 (Range 00 to 99, null when

not tracking)

Checksum *73

<CR> <LF> End of message termination

Table 7: GNSS Satellites in View Example

GLL – Geographic Position – Latitude / Longitude

The table below contains the values for the following example:

$GPGLL,2503.6319,N,12136.0099,E,053740.000,A,A*52

GSA – GNSS DOP and Active Satellites

The table below contains the values for the following example:

$GPGSA,A,3,24,07,17,11,28,08,20,04,,,,,2.0,1.1,1.7*35

Name Example Units Description

Message ID $GPGLL GLL protocol header

Latitude 2503.6319 ddmm.mmmm

N/S indicator N N=north or S=south

Longitude 12136.0099 dddmm.mmmm

E/W indicator E E=east or W=west

UTC Time 053740 hhmmss.sss

Status A A=data valid or V=data not valid

Mode A A=autonomous, D=DGPS

Checksum *52

<CR> <LF> End of message termination

Name Example Units Description

Message ID $GPGSA GSA protocol header

Mode1 A See Table 7

Mode 2 3 1=No Fix, 2=2D, 3=3D

ID of satellite used 24 Sv on Channel 1

ID of satellite used 7 Sv on Channel 2

... ...

ID of satellite used Sv on Channel 12

PDOP 2 Position Dilution of Precision

HDOP 1.1 Horizontal Dilution of Precision

VDOP 1.7 Vertical Dilution of Precision

Checksum *35

<CR> <LF> End of message termination

Table 4: Geographic Position – Latitude / Longitude Example

Table 5: GNSS DOP and Active Satellites Example

Value Description

M Manual - forced to operate in 2D or 3D mode

A Automatic - allowed to automatically switch 2D/3D

Table 6: Mode1 Values

1 2 3 4 5 6 7 8 9 10 11 ... 14 15

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