– –
– –
14
15
GSV – GPS Satellites in View
Figure 13 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
Mode 1 Values
Value
Description
M
Manual – forced to operate in 2D or 3D mode
A
Automatic – allowed to automatically switch 2D/3D
Figure 13: GPS Satellites in View Example
GPS Satellites in View Example
Name
Example
Units
Description
Message ID
$GPGSV
GSV protocol header
Total number of
messages
1
3
Range 1 to 3
Message number
1
1
Range 1 to 3
Satellites in view
12
Satellite ID
28
Channel 1 (Range 01 to 196)
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
077
degrees
Channel 4 (Range 00 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
1. Depending on the number of satellites tracked, multiple messages of GSV data
may be required.
Figure 12: Mode 1 Values
RMC – Recommended Minimum Specific GPS Data
Figure 14 contains the values for the following example:
$GPRMC,053740.000,A,2503.6319,N,12136.0099,E,2.69,79.65,100106,,,A*53
Recommended Minimum Specific GPS Data Example
Name
Example
Units
Description
Message ID
$GPRMC
RMC protocol header
UTC Time
053740.000
hhmmss.sss
Status
A
A=data valid or V=data not valid
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
Speed over ground
2.69
knots
TRUE
Course over ground
79.65
degrees
Date
100106
ddmmyy
Magnetic Variation
degrees
Not available, null field
Variation Sense
E=east or W=west (not shown)
Mode
A
A=autonomous, D=DGPS, N= Data
not valid
Checksum
*53
<CR> <LF>
End of message termination
Figure 14: Recommended Minimum Specific GPS Data Example
