CONFIGURATION AND SPECIFICATIONS
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(2.5.17) GNS – GNSS fix data
Navigational status indicator
Differential reference station ID
Age of differential data
Geoidal separation, m
Antenna altitude, m, re:mean-sea-level (geoid)
$--GNS, hhmmss.ss, llll.ll, a, yyyyy.yy, a, c---c, xx, x.x, x.x, x.x, x.x, x.x, a*hh<CR><LF>
HDOP
Total number of satellites in use, 00-99
Mode indicator: N = No fix, A = Autonomous, D = Differential,
P = Precise, R = Real Time Kinematic, F = Float RTK,
E = Estimated, M = Manual input, S = Simulator
Longitude, E/W
Latitude, N/S
UTC of position
(2.5.18) HBT – Heartbeat supervision sentence
$--HBT,x.x,A,x*hh<CR><LF>
Sequential sentence identifier
Equipment status
Configured repeat interval
(2.5.19) HDG – Heading, deviation and variation
$--HDG, x.x, x.x, a, x.x, a*hh<CR><LF>
Magnetic variation, degrees E/W
Magnetic deviation, degrees E/W
Magnetic sensor heading, degrees
(2.5.20) HDT – Heading true
$--HDT, x.x, T*hh<CR><LF>
Heading, degrees true
(2.5.21) LRI – Long-Range Interrogation
Longitude – E/W (south-west co-ordinate)
Latitude – N/S (south-west co-ordinate)
$--LRI,x,a,xxxxxxxxx,xxxxxxxxx,llll.ll,a,yyyyy.yy,a,llll.ll,a,yyyyy.yy,a*hh<CR><LF>
Longitude – E/W (north-east co-ordinate)
Latitude – N/S (north-east co-ordinate)
MMSI of "destination"
MMSI of "requestor"
Control Flag
Sequence number, 0 to 9
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