public override void Empty()
{
base.Empty();
IsLoranBlinkOK = NMEA.Boolean.Unknown;
IsLoranCCycleLockOK = NMEA.Boolean.Unknown;
CrossTrackErrorMagnitude = 0.0D;
DirectionToSteer = NMEA.LeftOrRight.Unknown;
CrossTrackUnits = string.Empty;
IsArrivalCircleEntered = NMEA.Boolean.Unknown;
IsPerpendicular = NMEA.Boolean.Unknown;
BearingOriginToDestination = 0.0D;
BearingOriginToDestinationUnits = string.Empty;
To = string.Empty;
BearingPresentPositionToDestination = 0.0D;
BearingPresentPositionToDestinationUnits = string.Empty;
HeadingToSteer = 0.0D;
HeadingToSteerUnits = string.Empty;
FAAMode = NMEA.FAAModeIndicator.Unknown;
}
public override bool Parse(Sentence sentence)
{
/*
** APB - Autopilot Sentence "B"
** 13 15
** 1 2 3 4 5 6 7 8 9 10 11 12| 14|
** | | | | | | | | | | | | | | |
** $--APB,A,A,x.x,a,N,A,A,x.x,a,c--c,x.x,a,x.x,a*hh<CR><LF>
**
** 1) Status
** V = LORAN-C Blink or SNR warning
** V = general warning flag or other navigation systems when a reliable
** fix is not available
** 2) Status
** V = Loran-C Cycle Lock warning flag
** A = OK or not used
** 3) Cross Track Error Magnitude
** 4) Direction to steer, L or R
** 5) Cross Track Units, N = Nautical Miles
** 6) Status
** A = Arrival Circle Entered
** 7) Status
** A = Perpendicular passed at waypoint
** 8) Bearing origin to destination
** 9) M = Magnetic, T = True
** 10) Destination Waypoint ID
** 11) Bearing, present position to Destination
** 12) M = Magnetic, T = True
** 13) Heading to steer to destination waypoint
** 14) M = Magnetic, T = True
** 15) Checksum or FAA Mode Indicator
** 16) Checksum if FAA Mode Indicator is present
*/
// 2005-02-24, according to http://gpsd.berlios.de/NMEA.txt, NMEA added another field to the sentence
/*
** First we check the checksum...
*/
if (sentence.IsChecksumBad() == Boolean.True)
{
Empty();
return(false);
}
IsLoranBlinkOK = sentence.Boolean(1);
IsLoranCCycleLockOK = sentence.Boolean(2);
CrossTrackErrorMagnitude = sentence.Double(3);
DirectionToSteer = sentence.LeftOrRight(4);
CrossTrackUnits = sentence.Field(5);
IsArrivalCircleEntered = sentence.Boolean(6);
IsPerpendicular = sentence.Boolean(7);
BearingOriginToDestination = sentence.Double(8);
BearingOriginToDestinationUnits = sentence.Field(9);
To = sentence.Field(10);
BearingPresentPositionToDestination = sentence.Double(11);
BearingPresentPositionToDestinationUnits = sentence.Field(12);
HeadingToSteer = sentence.Double(13);
HeadingToSteerUnits = sentence.Field(14);
if (sentence.GetNumberOfDataFields() == 16)
{
// Parse here...
FAAMode = sentence.FAAMode(15);
}
else
{
FAAMode = FAAModeIndicator.Unknown;
}
return(true);
}