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1-6 NMEA Reference Manual—December 2007

VTG—Course Over Ground and Ground Speed

Note – Fields marked in italic red apply only to NMEA version 2.3 (and later) in this

NMEA message description.

Table 1-12 contains the values for the following example:

$GPVTG,309.62,T, ,M,0.13,N,0.2,K,A*23

ZDA—SiRF Timing Message

Outputs the time associated with the current 1 PPS pulse. Each message is output

within a few hundred ms after the 1 PPS pulse is output and tells the time of the pulse

that just occurred.

Table 1-13 contains the values for the following example:

$GPZDA,181813,14,10,2003,00,00*4F

Table 1-12 VTG Data Format

Name Example Unit Description

Message ID $GPVTG VTG protocol header

Course 309.62 degrees Measured heading

Reference T True

Course degrees Measured heading

Reference M Magnetic

1. SiRF Technology Inc. does not support magnetic declination. All “course over ground” data are geodetic WGS84

directions.

Speed 0.13 knots Measured horizontal speed

Units N Knots

Speed 0.2 km/hr Measured horizontal speed

Units K Kilometers per hour

Mode A A=Autonomous, D=DGPS, E=DR

Checksum *23

<CR> <LF> End of message termination

Table 1-13 ZDA Data Format

Name Example Unit Description

Message ID $GPZDA ZDA protocol header

UTC time 181813 hhmmss The UTC time units are as follows:

hh = UTC hours from 00 to 23

mm = UTC minutes from 00 to 59

ss = UTC seconds from 00 to 59

Either using valid IONO/UTC or estimated from default

leap seconds

Day 14 01 TO 31

Month 10 01 TO 12

Year 2003 1980 to 2079

Local zone hour 00 hour Offset from UTC (set to 00)

Local zone minutes 00 minute Offset from UTC (set to 00)

Checksum *4F

<CR> <LF> End of message termination

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 26 27

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