Raymarine AIS950 Installation Instructions Manual page 62

Technical reference
$--GLL, llll.ll, a, yyyyy.yy, a, hhmmss.ss, A, a *hh<CR><LF>
3 hhmmss.ss
4 A
5 a
6.8.10 GNS - GNSS fix data
This sentence provides fix data for a single or combined satellite navigation system. The sentence provides
data for GPS, GLONASS and possible future satellite systems and combinations thereof.
$-- GNS, hhmmss.ss, llll.ll, a, yyyyy.yy, a, c--c,xx,x.x,x.x,x.x,x.x,x.x *hh<CR><LF>
Field
number
1 hhmmss.ss
2 llll.ll, a
3 yyyyy.yy, a
4 c--c
5 xx
6 x.x
7 x.x
8 x.x
9 x.x
10 x.x
6.8.11 HDT - Heading, true
Actual vessel heading in degrees produced by a true heading system or device.
$--HDT, x.x, T*hh<CR><LF>
Field
number
1 x.x, T
Page 62
Time of position (UTC)
Status: A = data valid V = data invalid
Mode indicator:
A = Autonomous
D = Differential
E = Estimated (dead reckoning)
M = Manual input
S = Simulator
N = Data not valid
Description
Time of position (UTC)
Latitude N/S
Longitude E/W
Mode indicator
Number of satellites in use, 00-99 - NOT USED
Horizontal dilution of precision (HDOP) - NOT USED
Antenna altitude, m, above mean-sea-level - NOT USED
Geoidal separation, m - NOT USED
Age of differential data - NOT USED
Differential reference station ID - NOT USED
Description
Heading, degrees true