Common NMEA Setence types
The following information
describes the NMEA-0183 sentences transmitted by TeleType GPS
receivers.
| Sentence |
Description |
| $GPGGA |
Global positioning system
fixed data |
| $GPGLL |
Geographic position -
latitude / longitude |
| $GPGSA |
GNSS DOP and active
satellites |
| $GPGSV |
GNSS satellites in view |
| $GPRMC |
Recommended minimum
specific GNSS data |
| $GPVTG |
Course over ground and
ground speed |
$GPGGA Sentence (Fix data)
Example (signal not acquired):
$GPGGA,235947.000,0000.0000,N,00000.0000,E,0,00,0.0,0.0,M,,,,0000*00
Example (signal acquired):
$GPGGA,092204.999,4250.5589,S,14718.5084,E,1,04,24.4,19.7,M,,,,0000*1F
| Field |
Example |
Comments |
| Sentence ID |
$GPGGA |
| UTC Time |
092204.999 |
hhmmss.sss |
| Latitude |
4250.5589 |
ddmm.mmmm |
| N/S Indicator |
S |
N = North, S = South |
| Longitude |
14718.5084 |
dddmm.mmmm |
| E/W Indicator |
E |
E = East, W = West |
| Position Fix |
1 |
0 = Invalid, 1 = Valid SPS,
2 = Valid DGPS, 3 = Valid PPS |
| Satellites Used |
04 |
Satellites being used
(0-12) |
| HDOP |
24.4 |
Horizontal dilution of
precision |
| Altitude |
19.7 |
Altitude in meters
according to WGS-84 ellipsoid |
| Altitude Units |
M |
M = Meters |
| Geoid Seperation |
|
Geoid seperation in meters
according to WGS-84 ellipsoid |
| Seperation Units |
|
M = Meters |
| DGPS Age |
|
Age of DGPS data in
seconds |
| DGPS Station ID |
0000 |
|
| Checksum |
*1F |
|
| Terminator |
CR/LF |
|
$GPGLL Sentence (Position)
Example (signal not acquired):
$GPGLL,0000.0000,N,00000.0000,E,235947.000,V*2D
Example (signal acquired):
$GPGLL,4250.5589,S,14718.5084,E,092204.999,A*2D
| Field |
Example |
Comments |
| Sentence ID |
$GPGLL |
| Latitude |
4250.5589 |
ddmm.mmmm |
| N/S Indicator |
S |
N = North, S = South |
| Longitude |
14718.5084 |
dddmm.mmmm |
| E/W Indicator |
E |
E = East, W = West |
| UTC Time |
092204.999 |
hhmmss.sss |
| Status |
A |
A = Valid, V = Invalid |
| Checksum |
*2D |
|
| Terminator |
CR/LF |
|
$GPGSA Sentence (Active
satellites)
Example (signal not acquired):
$GPGSA,A,1,,,,,,,,,,,,,0.0,0.0,0.0*30
Example (signal acquired):
$GPGSA,A,3,01,20,19,13,,,,,,,,,40.4,24.4,32.2*0A
| Field |
Example |
Comments |
| Sentence ID |
$GPGSA |
|
| Mode 1 |
A |
A = Auto 2D/3D, M = Forced
2D/3D |
| Mode 1 |
3 |
1 = No fix, 2 = 2D, 3 = 3D |
| Satellite used 1 |
01 |
Satellite used on channel
1 |
| Satellite used 2 |
20 |
Satellite used on channel
2 |
| Satellite used 3 |
19 |
Satellite used on channel
3 |
| Satellite used 4 |
13 |
Satellite used on channel
4 |
| Satellite used 5 |
|
Satellite used on channel
5 |
| Satellite used 6 |
|
Satellite used on channel
6 |
| Satellite used 7 |
|
Satellite used on channel
7 |
| Satellite used 8 |
|
Satellite used on channel
8 |
| Satellite used 9 |
|
Satellite used on channel
9 |
| Satellite used 10 |
|
Satellite used on channel
10 |
| Satellite used 11 |
|
Satellite used on channel
11 |
| Satellite used 12 |
|
Satellite used on channel
12 |
| PDOP |
40.4 |
Position dilution of
precision |
| HDOP |
24.4 |
Horizontal dilution of
precision |
| VDOP |
32.2 |
Vertical dilution of
precision |
| Checksum |
*0A |
|
| Terminator |
CR/LF |
|
$GPGSV Sentence (Satellites in
view)
Example (signal not acquired):
$GPGSV,1,1,01,21,00,000,*4B
Example (signal acquired):
$GPGSV,3,1,10,20,78,331,45,01,59,235,47,22,41,069,,13,32,252,45*70
| Field |
Example |
Comments |
| Sentence ID |
$GPGSV |
|
| Number of messages |
3 |
Number of messages in
complete message (1-3) |
| Sequence number |
1 |
Sequence number of this
entry (1-3) |
| Satellites in view |
10 |
|
| Satellite ID 1 |
20 |
Range is 1-32 |
| Elevation 1 |
78 |
Elevation in degrees
(0-90) |
| Azimuth 1 |
331 |
Azimuth in degrees (0-359) |
| SNR 1 |
45 |
Signal to noise ration in
dBHZ (0-99) |
| Satellite ID 2 |
01 |
Range is 1-32 |
| Elevation 2 |
59 |
Elevation in degrees
(0-90) |
| Azimuth 2 |
235 |
Azimuth in degrees (0-359) |
| SNR 2 |
47 |
Signal to noise ration in
dBHZ (0-99) |
| Satellite ID 3 |
22 |
Range is 1-32 |
| Elevation 3 |
41 |
Elevation in degrees
(0-90) |
| Azimuth 3 |
069 |
Azimuth in degrees (0-359) |
| SNR 3 |
|
Signal to noise ration in
dBHZ (0-99) |
| Satellite ID 4 |
13 |
Range is 1-32 |
| Elevation 4 |
32 |
Elevation in degrees
(0-90) |
| Azimuth 4 |
252 |
Azimuth in degrees (0-359) |
| SNR 4 |
45 |
Signal to noise ration in
dBHZ (0-99) |
| Checksum |
*70 |
|
| Terminator |
CR/LF |
|
$GPRMC Sentence (Position and
time)
Example (signal not acquired):
$GPRMC,235947.000,V,0000.0000,N,00000.0000,E,,,041299,,*1D
Example (signal acquired):
$GPRMC,092204.999,A,4250.5589,S,14718.5084,E,0.00,89.68,211200,,*25
| Field |
Example |
Comments |
| Sentence ID |
$GPRMC |
|
| UTC Time |
092204.999 |
hhmmss.sss |
| Status |
A |
A = Valid, V = Invalid |
| Latitude |
4250.5589 |
ddmm.mmmm |
| N/S Indicator |
S |
N = North, S = South |
| Longitude |
14718.5084 |
dddmm.mmmm |
| E/W Indicator |
E |
E = East, W = West |
| Speed over ground |
0.00 |
Knots |
| Course over ground |
0.00 |
Degrees |
| UTC Date |
211200 |
DDMMYY |
| Magnetic variation |
|
Degrees |
| Magnetic variation |
|
E = East, W = West |
| Checksum |
*25 |
|
| Terminator |
CR/LF |
|
$GPVTG Sentence (Course over
ground)
Example (signal not acquired):
$GPVTG,,T,,M,,N,,K*4E
Example (signal acquired): $GPVTG,89.68,T,,M,0.00,N,0.0,K*5F
| Field |
Example |
Comments |
| Sentence ID |
$GPVTG |
|
| Course |
89.68 |
Course in degrees |
| Reference |
89.68 |
T = True heading |
| Course |
|
Course in degrees |
| Reference |
89.68 |
M = Magnetic heading |
| Speed |
0.00 |
Horizontal speed |
| Units |
N |
N = Knots |
| Speed |
0.00 |
Horizontal speed |
| Units |
K |
K = KM/h |
| Checksum |
*5F |
|
| Terminator |
CR/LF |
|
|
