Oliver LEGACY ELITE 2022, Manual

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User Manual / IBR900/IBR950 1/5/17
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 Description
1753405 Time of fix – 17:34:05 UTC
4916.450,N Latitude 49 deg. 16.450 min North
12311.127,W Longitude 123 deg. 11.127 min Wes
2
Fix quality: 0 = fix not available; 1 = GPS fix; 2 = Differential GPS fix; 3 = PPS fix; 4 = Real Time Kinematic; 5 =
Float RTK; 6 = estimated (dead reckoning); 7 = Manual input mode; 8 = Simulation mode
06 Number of satellites being tracked
1.5 Horizontal dilution of precision (HDOP) – relative accuracy of horizontal position
117.312,M Altitude in meters above mean sea level
-26.574,M
Geoidal separation: height of mean sea level above WGS-84 earth ellipsoid (negative value means mean sea level
is below ellipsoid)
6.0 Time in seconds since last update from differential reference stations
0138 Differential reference station ID number
*47 Checksum – used by program to check for transmission errors
RMC
$GPRMC – Recommended minimum specific GPS/transit data
Example: $GPRMC,144317.0,A,4337.190528,N,11612.329073,W,0.0,329.2,161015,0.0,E,A*16
Sample Data Description
144317 Time of fix – 14:43:17 UTC
A Navigation receiver warning A = OK, V = warning
4337.190528,N Latitude 43 deg. 37.190528 min North
11612.329073,W Longitude 116 deg. 12.329073 min West
0.0 Speed over ground, knots
329.2 Course made good, true
161015 Date of fix – 16 October 2015
0.0,E Magnetic variation: 0.0 degrees East
A*16 Mode Indicator