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package nmea
const (
// TypeXTE type of XTE sentence for Cross-track error, measured
TypeXTE = "XTE"
)
// XTE - Cross-track error, measured
// https://gpsd.gitlab.io/gpsd/NMEA.html#_xte_cross_track_error_measured
//
// Format: $--XTE,A,A,x.x,a,N*hh<CR><LF>
// Format (NMEA 2.3): $--XTE,A,A,x.x,a,N,m*hh<CR><LF>
// Example: $GPXTE,V,V,,,N,S*43
type XTE struct {
BaseSentence
// StatusGeneralWarning is used for warnings
// * V = LORAN-C Blink or SNR warning
// * A = general warning flag or other navigation systems when a reliable fix is not available
StatusGeneralWarning string
// StatusLockWarning is used for lock warning
// * V = Loran-C Cycle Lock warning flag
// * A = OK or not used
StatusLockWarning string
// CrossTrackErrorMagnitude is Cross Track Error Magnitude
CrossTrackErrorMagnitude float64
// DirectionToSteer is Direction to steer,
// * L = left
// * R = right
DirectionToSteer string
// CrossTrackUnits is cross track units
// * N = nautical miles
// * K = for kilometers
CrossTrackUnits string
// FAA mode indicator (filled in NMEA 2.3 and later)
FFAMode string
}
// newXTE constructor
func newXTE(s BaseSentence) (Sentence, error) {
p := NewParser(s)
p.AssertType(TypeXTE)
xte := XTE{
BaseSentence: s,
StatusGeneralWarning: p.EnumString(0, "general warning", StatusWarningAClearORNotUsedAPB, StatusWarningASetAPB),
StatusLockWarning: p.EnumString(1, "lock warning", StatusWarningBSetAPB, StatusWarningBClearAPB),
CrossTrackErrorMagnitude: p.Float64(2, "cross track error magnitude"),
DirectionToSteer: p.EnumString(3, "direction to steer", Left, Right),
CrossTrackUnits: p.EnumString(4, "cross track units", DistanceUnitKilometre, DistanceUnitNauticalMile, DistanceUnitStatuteMile, DistanceUnitMetre),
}
if len(p.Fields) > 5 {
xte.FFAMode = p.String(5, "FAA mode") // not enum because some devices have proprietary "non-nmea" values
}
return xte, p.Err()
}
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