Appendix 2-2
[1-3] Data Format
HDT - Heading true
$GPHDT,xxx.x,T*hh<CR><LF>
1 2
1: Heading, degrees true
2: Checksum (Version 2.1, 2.3)
THS - True heading and status
$GPTHS,xxx.x,x*hh<CR><LF>
1 2 3
1: Heading, degrees true
2: Mode indicator
A = Autonomous
E = Estimated (dead reckoning)
S = Simulator mode
V = Data not valid (including standby)
3: Checksum
ROT - Rate of turn
$GPROT,uxxxx.x,A*hh<CR><LF>
1 2 3
1: Rate of turn, °/min, "-" = bow turns to port
2: Status
A = data valid
V = data invalid
3: Checksum
ZDA - Time and date
Version 1.5
$GPZDA, hhmmss,xx,xx,xxxx,xx,xx<CR><LF>
1 2 3 4 5 6
Version 2.1,2.3,IEC
$GPZDA, hhmmss.ss,xx,xx,xxxx,xx,xx*hh<CR><LF>
1 2 3 4 5 6 7
1: UTC
2: Day, 01 to 31 (UTC)
3: Month, 01 to 12 (UTC)
4: Year (UTC)
5: Local zone hours, 00h to ±13h (+: Not indicate)
6: Local zone minutes, 00 to +59 (+: Not indicate)
7: Checksum
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