Furuno VR-7000S Installation Manual page 115

VTG - Course over ground and ground speed
$--VTG,x.x,T,x.x,M,x.x,N,x.x,K,a*hh <CR><LF>
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1. Course over ground, degrees (0.0 to 359.9)
2. T=True (fixed)
3. Course over ground, degrees (0.0 to 359.9)
4. M=Magnetic (fixed)
5. Speed over ground, knots (0.00 to 9999.9)
6. N=Knots (fixed)
7. Speed over ground (0.00 to 9999.9)
8. K=km/h (fixed)
9. Mode indicator (A=Autonomous, D=Differential E=Estimated (dead reckoning)
M=Manual input S=Simulator N=Data not valid)
WAT - Water level detection
$--WAT, a, hhmmss.ss, aa, xx, xx, xxx, a, a, c--c*hh<CR><LF>
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1. Message type
S: Status for section: Number of faulty and activated condition reported as number in field 4 and 5.
The section may be a whole section (one or both of the location indicator fields are null) or a
sub-section. The stusus S is normally transmitted at regular intervals.
E: Status for each water level detector. (E may be used to indicate an event.)
F: Fault in system: location indicator fields define the sections when provided.
2. Time stamp
Time when this status/message was valid.
3. Type of water alarm
Indicator characters showing system detecting water level. The field is two characters.
WL = Water level ditection system;
BI = High water level by bilge system;
HD = Water leakage at hull (shell) door;
OT = others.
4. First location indicator
First location indicator characters showing detection location. This field is two characters.
The contents of this field is not defined by this standard, but the two location fields should
uniquely define the source for the alarm.
5. Second location indicator
Second location indicator characters showing detection location. This field is two characters.
The contents of this field is not defined by this standard, but the two location fields should
uniquely define the source for the alarm.
6. Detection point number or detection point count
This field is three fixed numeric characters. When the message type field is E this field identifies
the high-water-level detection point. When the message type field is S this field contains the number
of the water leakage detection points. When the message type field is F this field is a null field.
7. Alarm condition
This field is a single character specified by the following:
N = normal state
H = alarm state (threshold exceeded)
J = alarm state (extreme threshold exceeded)
L = alarm state (Low threshold exceeded i.e. not reached)
K = alarm state(extreme low threshold exceeded i.e. not reached)
X = Fault (state unknown)
8. Override setting
O = Override mode (water allowed in space);
N = Normal mode (water not allowed in space);
9. Message description text
Descriptive text/level detector tag. If a level detector identifier type, it is possible to use this field
instead of above level detector fields. Maximum number of characters will be limited by maximum
sentence length and length of other fields.
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APPENDIX 4 DIGITAL INTERFACE
AP-27