APPENDICES Page 58
Document id: 7000 108-011 A2
HDT - Heading, True
The use of this sentence is talker identifier dependent.
Field Comment
Heading Used if Valid indicator is T
Valid Indicator Used
OSD- Own Ship Data
Field Comment
Heading, Degrees TRUE Used if heading status is ‘A’
Heading Status Used
Vessel Course Used as COG
Course Reference Used
1
Vessel Speed Used as SOG
Speed Reference
Used
1
Vessel Set Ignored
Vessel Drift Ignored
Speed Units Used to convert SOG to knots
RMC - Recommended Minimum Specific GNSS Data
Field Comment
UTC of Position Fix UTC Second is used to indicate Time Stamp
Status Ignored
Latitude (2 fields) Used
Longitude (2 fields) Used
SOG, knots Used
COG, degrees Used
Date Ignored
Magnetic Variation (2 fields) Ignored
Mode Indicator NULL -> Message is ignored
A -> Position with low accuracy
D -> Position with high accuracy
E -> Dead Reckoning Mode with Low accuracy
M -> Manual Mode with low accuracy
OTHER -> No Position
ROT - Rate Of Turn
The rate of turn value is only used if the talker identifier is TI.
Otherwise the value will only be used to determine the direction,
i.e. ”Moving Right” or ”Moving Left”.
Field Comment
Rate of turn Used when status is A. The value is rounded to
the closest integer.
Status Used
1
SOG and COG are used if both COG reference and SOG reference are set to either: B, P, R
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