–

–

–

–

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

3

Range 1 to 3

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