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APPENDIX 4 DIGITAL INTERFACE
GNS-GNSS fix data
$--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>
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+--+--------------------------------------------- 2
+------------------------------------------------------------- 1
HDT-Heading true
OSD-Own ship data
$--OSD,x.x,A,x.x,a,x.x,a,x.x,x.x,a*hh<CR><LF>
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| +------------------------ 5
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+--------------------------- 4
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+------------------------------------ 1
AP-10
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+------------------ 7
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| +---------------------- 6
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+------------------------- 5
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+-------+--------------------------------- 3
$--HDT,x.x,T*hh<CR><LF>
+----+----------- 1
1. Heading, degrees true
2. Checksum
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+--------- 10
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+----------- 9
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+-------------- 8
+------------------ 7
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+--- 11
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+------ 10
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+---------- 9
+-------------- 8
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1. Heading, degrees true
2. Heading status: A=data valid, V=data invalid
3. Vessel course, degrees true
4. Course reference, B/M/W/R/P(see note)
5. Vessel speed
6. Speed reference, B/M/W/R/P(see note)
7. Not used
8. Not used
9. Speed units, K(km/h) / N(Knots) / S(statute miles/h)
10. Checksum
NOTES - Reference systems(speed/course):
B = bottom tracking log
M = manually entered
W = water referenced
R = radar tracking(of fixed target)
P = positioning system ground reference
1. Not used
2. Latitude, N/S
3. Longitude, E/W
4. Mode indicator
5. Not used
6. Not used
7. Not used
8. Not used
9. Not used
10. Not used
11. Checksum
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