Raytheon STD 21 GPS Operation Manual page 102

• NMEA 0183 Format ROT
$- - - -ROT,x.x,A*hh<CR><LF>
Update rate 1 Hz and Update rate 50 Hz
• NMEA 0183 Format VTG
$- - - -VTG,x.x,T,x.x,M,x.x,N,x.x,K,a*hh<CR><LF>
Update rate 1 Hz
• NMEA 0183 Format ZDA
$- - - -ZDA,hhmmss.ss,xx,xx,xxxx,xx,xx,*hh<CR><LF>
Update rate 1 Hz
3717/110--850.DOC020002
ROT ⇒ Rate Of Turn
Status
Rate of turn, degrees/minute, "--" = bow turns to port
VTG ⇒ Course Over Ground and Ground Speed
Course over ground, degree Magnetic
Course over ground, degrees True
ZDA ⇒ Time & Date
Satellite Compass
STD 21 GPS
A = Data valid
V = Data invalid
Mode Indicator
Speed over ground, km/hr
Speed over ground, knots
Local zone minutes, 00 to +59
Local zone hours, 00 to +/-- 13 hrs
Year
Month, 01 to 12
Day, 01 to 31
UTC
94
UTC
Edition: Feb. 05, 2007