Cradlepoint COR IBR350 Manual page 127

NMEA GGA, RMC, and VTG sentences Some devices report GPS information with multiple NMEA (National Marine Electronics Association)
sentence formats: GGA, RMC, and VTG. See the examples below. For more examples and information about NMEA sentences, see the following
websites:
• http://aprs.gids.nl/nmea/
• http://www.gpsinformation.org/dale/nmea.htm#nmea
GGA $GPGGA – Essential fix data including 3D location and accuracy information
Example: $GPGGA,1753405,4916.450,N,12311.127,W,2,06,1.5,117.3,M,−26.574,M,6.0,0138*47
Sample Data
1753405
4916.450,N
12311.127,W
2
06
1.5
117.312,M
−26.574,M
6.0
0138
47 | Checksum – used by program to check for transmission errors|
RMC $GPRMC – Recommended minimum specific GPS/transit data
Example: $GPRMC,225446,A,4916.45,N,12311.12,W,000.5,054.7,191194,020.3,E*68
Sample Data
225446
A
4916.45,N
12311.12,W
000.5
054.7
191194
020.3,E
68 | Checksum is mandatory for RMC |
VTG GPVTG – Vector track and speed over ground Example: $GPVTG,054.7,T,034.4,M,005.5,N,010.2,K
Description
Time of fix – 17:34:05 UTC
Latitude 49 deg. 16.450 min North
Longitude 123 deg. 11.127 min West
Fix quality: 0 = fix not available; 1 = GPS fix; 2 = Differential GPS fix; 3 = PPS fix; 4 =
Number of satellites being tracked
Horizontal dilution of precision (HDOP) – relative accuracy of horizontal position
Altitude in meters above mean sea level
Geoidal separation: height of mean sea level above WGS-84 earth ellipsoid (negative
Time in seconds since last update from differential reference stations
Differential reference station ID number
Description
Time of fix – 22:54:46 UTC
Navigation receiver warning A = OK, V = warning
Latitude 49 deg. 16.45 min North
Longitude 123 deg. 11.12 min West
Speed over ground, knots
Course made good, true
Date of fix – 19 November 1994
Magnetic variation: 20.3 degrees East
Sample Data Description
054.7,T Track, degrees relative to true north
034.4,M Track, degrees relative to magnetic north
005.5,N Ground speed, knots
010.2,K Ground speed, kilometers per hour
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