GPVTG

Track made good and ground speed

Platform:

OEM719, OEM729, OEM7500, OEM7600, OEM7700, OEM7720, PwrPak7, SPAN CPT7, SMART7, SMART2

Firmware Stream:     

This log contains the track made good and speed relative to the ground.

The GPVTG log outputs these messages without waiting for a valid almanac. Instead, it uses a UTC time, calculated with default parameters. In this case, the UTC time status (see the TIME log) is set to WARNING since it may not be one hundred percent accurate. When a valid almanac is available, the receiver uses the real parameters. Then the UTC time status is set to VALID.

Message ID: 226

Log Type: Synch

Recommended Input:

log gpvtg ontime 1

Example 1 (GPS only):

$GPVTG,172.516,T,155.295,M,0.049,N,0.090,K,D*2B

Example 2 (Combined GPS and GLONASS):

$GNVTG,134.395,T,134.395,M,0.019,N,0.035,K,A*33

If the NMEATALKER command is set to AUTO, the talker (the first 2 characters after the $ sign in the log header) is set to GP (GPS satellites only), GL (GLONASS satellites only) or GN (satellites from both systems).

See the Note in the GPGGA log that applies to all NMEA logs.

Field

Structure

Description

Symbol

Example

1

$GPVTG

Log header. See Messages for more information.

 

$GPVTG

2

track true

Track made good, degrees True

x.x

24.168

3

T

True track indicator

T

T

4

track mag

Track made good, degrees Magnetic;

Track mag = Track true + (MAGVAR correction)

See the MAGVAR command

x.x

24.168

5

M

Magnetic track indicator

M

M

6

speed Kn

Speed over ground, knots

x.x

0.4220347

7

N

Nautical speed indicator (N = Knots)

N

N

8

speed Km

Speed, kilometers/hour

x.x

0.781608

9

K

Speed indicator (K = km/hr)

K

K

10

mode ind

Positioning system mode indicator, see Table: NMEA Positioning System Mode Indicator

a

A

11

*xx

Check sum

*hh

*7A

12

[CR][LF]

Sentence terminator

 

[CR][LF]

NMEA Positioning System Mode Indicator

Mode

Indicator

A

Autonomous

D

Differential

E

Estimated (dead reckoning) mode

M

Manual input

N

Data not valid

 

OM-20000167 v14

November 2019

Email comments to NovAtel_TPUBS@NovAtel.com

7.07.03 / OM7MR0703RN0000
PP7 07.07.04 / EP7PR0704RN0000
7.06.03 / OA7CR0603RN0000