SkyTraq PX1120S - Page 18

18
SkyTraq Technology, Inc. Preliminary Draft www.skytraq.com.tw
VTG – Course Over Ground and Ground Speed
The actual course and speed relative to the ground.
Structure:
GNVTG,x.x,T,,M,x.x,N,x.x,K,a*hh<CR><LF>
1 2 3 4 5
Example:
$GNVTG,169.9,T,,M,000.0,N,000.0,K,D*11<CR><LF>
Field
Name
Example
Description
1
Course
169.9
True course over ground in degrees (000.0 ~ 359.9)
2
Speed
000.0
Speed over ground in knots (000.0 ~ 999.9)
3
Speed
000.0
Speed over ground in kilometers per hour (000.0 ~ 1800.0)
4
Mode
D
Mode indicator
‘A’ = Autonomous mode
‘D’ = Differential mode
‘E’ = Estimated (dead reckoning) mode
‘M’ = Manual input mode
‘N’ = Data not valid
‘P’ = Precise
‘S’ = Simulator mode
5
Checksum
11
ZDA – TIME AND DATE
UTC, day, month, year and local time zone
Structure:
$GNZDA,hhmmss.sss,xx,xx,xxxx,xx,xx*hh<CR><LF>
1 2 3 4 5 6 7
Example:
$GNZDA,052315.000,26,12,2019,00,00*45<CR><LF>
Field
Name
Example
Units
Description
1
UTC time
052315.000
UTC time in hhmmss.sss format (000000.00 ~ 235959.999)
2
UTC Day
26
UTC time: day (01 ~ 31)
3
UTC Month
12
UTC time: month (01 ~ 12)
4
UTC Year
209
UTC time: year (4 digit format)
5
Local zone hour
00
Local zone hours (00 ~ +/- 13)
6
Local zone minutes
00
Local zone minutes (00 ~59)
7
Checksum
45
Checksum