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package nmea
const (
// TypeVBW type of VBW sentence for Dual Ground/Water Speed
TypeVBW = "VBW"
)
// VBW - Dual Ground/Water Speed
// https://gpsd.gitlab.io/gpsd/NMEA.html#_vbw_dual_groundwater_speed
//
// Format: $--VBW,x.x,x.x,A,x.x,x.x,A,x.x,A,x.x,A*hh<CR><LF>
// Example: $VMVBW,-7.1,0.1,A,,,V,,V,,V*65
type VBW struct {
BaseSentence
LongitudinalWaterSpeedKnots float64 // longitudinal water speed, "-" means astern, knots
TransverseWaterSpeedKnots float64 // transverse water speed, "-" means port, knots
WaterSpeedStatusValid bool // A = true
WaterSpeedStatus string // A = valid, V = invalid
LongitudinalGroundSpeedKnots float64 // longitudinal ground speed, "-" means astern, knots
TransverseGroundSpeedKnots float64 // transverse ground speed, "-" means port, knots
GroundSpeedStatusValid bool // A = true
GroundSpeedStatus string // A = valid, V = invalid
SternTraverseWaterSpeedKnots float64 // Stern traverse water speed, knots (NMEA 3 and above)
SternTraverseWaterSpeedStatusValid bool // A = true
SternTraverseWaterSpeedStatus string // A = valid, V = invalid (NMEA 3 and above)
SternTraverseGroundSpeedKnots float64 // Stern traverse ground speed, knots (NMEA 3 and above)
SternTraverseGroundSpeedStatusValid bool // A = true
SternTraverseGroundSpeedStatus string // A = valid, V = invalid (NMEA 3 and above)
}
// newVBW constructor
func newVBW(s BaseSentence) (Sentence, error) {
p := NewParser(s)
p.AssertType(TypeVBW)
m := VBW{
BaseSentence: s,
LongitudinalWaterSpeedKnots: p.Float64(0, "longitudinal water speed"),
TransverseWaterSpeedKnots: p.Float64(1, "transverse water speed"),
WaterSpeedStatusValid: p.String(2, "water speed status valid") == StatusValid,
WaterSpeedStatus: p.EnumString(2, "water speed status", StatusValid, StatusInvalid),
LongitudinalGroundSpeedKnots: p.Float64(3, "longitudinal ground speed"),
TransverseGroundSpeedKnots: p.Float64(4, "transverse ground speed"),
GroundSpeedStatusValid: p.String(5, "ground speed status valid") == StatusValid,
GroundSpeedStatus: p.EnumString(5, "ground speed status", StatusValid, StatusInvalid),
}
if len(p.Fields) > 6 {
m.SternTraverseWaterSpeedKnots = p.Float64(6, "stern traverse water speed")
m.SternTraverseWaterSpeedStatusValid = p.String(7, "stern water speed status valid") == StatusValid
m.SternTraverseWaterSpeedStatus = p.EnumString(7, "stern water speed status", StatusValid, StatusInvalid)
m.SternTraverseGroundSpeedKnots = p.Float64(8, "stern traverse ground speed")
m.SternTraverseGroundSpeedStatusValid = p.String(9, "stern ground speed status valid") == StatusValid
m.SternTraverseGroundSpeedStatus = p.EnumString(9, "stern ground speed status", StatusValid, StatusInvalid)
}
return m, p.Err()
}
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