Technical reference
Page 68
6.8.14 RMC - Recommended minimum specific GNSS data
Time, date, position, course and speed information provided by a GNSS receiver. All data fields should be
provided and null fields only used when data is temporarily unavailable.
6.8.15 ROT - Rate of turn
This sentence provides rate of turn and direction of turn information.
6.8.16 SSD - Station static data
This sentence is used to enter static parameters into the ship’s AIS transceiver. The parameters in this
message provide contents for various ITU-R M.1371 messages.
$--RMC, hhmmss.ss, A, llll.ll,a, yyyyy.yy, a, x.x, x.x, xxxxxx, x.x,a, a*hh<CR><LF>
Field
number
Description
1 hhmmss.ss Time of position fix (UTC)
2 A Status: A = data valid V = navigation receiver warning
3 llll.ll, a Latitude, N/S
4 yyyyy.yy, a Longitude, E/W
5 x.x Speed over ground, knots
6 x.x
Course over ground, degrees true
7 xxxxxx
Date: dd/mm/yy - NOT USED
8 x.x, a Magnetic variation, degrees, E/W - NOT USED
10 a Mode indicator:
A = Autonomous mode
D = Differential mode
E = Estimated (dead reckoning) mode
M = Manual input mode
S = Simulator mode
N = Data not valid
$--ROT, x.x, A*hh<CR><LF>
Field
number
Description
1 x.x Rate of turn, °/min, "-" = bow turns to port
2 A Status: A = data valid, V = data invalid
$--SSD,c--c,c--c,xxx,xxx,xx,xx,c,aa*hh<CR><LF>
Field
number
Description
1 c--c Ship's Call Sign, 1 to 7 characters
2 c--c Ship's Name, 1 to 20 characters
3 xxx Pos. ref., "A," distance from bow, 0 to 511 metres
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