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package nmea
const (
// TypeVWR type of VWR sentence for Relative Wind Speed and Angle
TypeVWR = "VWR"
)
// VWR - Relative Wind Speed and Angle. Speed is measured relative to the moving vessel.
// According to NMEA: use of $--MWV is recommended.
// https://gpsd.gitlab.io/gpsd/NMEA.html#_vwr_relative_wind_speed_and_angle
// https://www.nmea.org/Assets/100108_nmea_0183_sentences_not_recommended_for_new_designs.pdf (page 16)
//
// Format: $--VWR,x.x,a,x.x,N,x.x,M,x.x,K*hh<CR><LF>
// Example: $IIVWR,75,R,1.0,N,0.51,M,1.85,K*6C
// $IIVWR,024,L,018,N,,,,*5e
// $IIVWR,,,,,,,,*53
type VWR struct {
BaseSentence
MeasuredAngle float64 // Measured Wind direction magnitude in degrees (0 to 180 deg)
MeasuredDirectionBow string // Measured Wind direction Left/Right of bow
SpeedKnots float64 // Measured wind Speed, knots
SpeedKnotsUnit string // N = knots
SpeedMPS float64 // Wind speed, meters/second
SpeedMPSUnit string // M = m/s
SpeedKPH float64 // Wind speed, km/hour
SpeedKPHUnit string // M = km/h
}
// newVWR constructor
func newVWR(s BaseSentence) (Sentence, error) {
p := NewParser(s)
p.AssertType(TypeVWR)
return VWR{
BaseSentence: s,
MeasuredAngle: p.Float64(0, "measured wind angle"),
MeasuredDirectionBow: p.EnumString(1, "measured wind direction to bow", Left, Right),
SpeedKnots: p.Float64(2, "wind speed in knots"),
SpeedKnotsUnit: p.EnumString(3, "wind speed in knots unit", SpeedKnots),
SpeedMPS: p.Float64(4, "wind speed in meters per second"),
SpeedMPSUnit: p.EnumString(5, "wind speed in meters per second unit", SpeedMeterPerSecond),
SpeedKPH: p.Float64(6, "wind speed in kilometers per hour"),
SpeedKPHUnit: p.EnumString(7, "wind speed in kilometers per hour unit", SpeedKilometerPerHour),
}, p.Err()
}
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