GMM-U1 Datasheet, PDF (22/36 Pages) List of Unclassifed Manufacturers – GPS Module

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Gmm-u1 Data Sheet
22 _{Ver. V0G}
VTG—Course and speed information relative to the ground
Table-9 contains the values for the following example:
$GPVTG,165.48,T,,M,0.03,N,0.06,K,A*37
Name
Message ID
Course
Reference
Course
Reference
Speed
Units
Speed
Units
Mode
Checksum
<CR> <LF>
Table-9: VTG Data Format
Example Units
Description
$GPVTG
VTG protocol header
165.48
degrees Measured heading
T
True
degrees Measured heading
M
Magnetic
(Need GlobalTop Customization
Service)
0.03
knots Measured horizontal speed
N
Knots
0.06
km/hr Measured horizontal speed
K
Kilometers per hour
A
A= Autonomous mode
D= Differential mode
E= Estimated mode
*06
End of message termination
3.2 MTK NMEA Command Protocols
Packet Type:
103 PMTK_CMD_COLD_START
Packet Meaning:
Cold Start：Don’t use Time, Position, Almanacs and Ephemeris data at re-start.
Example:
$PMTK103*30<CR><LF>
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