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package nmea
const (
// TypeHDG type of HDG sentence for vessel heading, deviation and variation with respect to magnetic north.
TypeHDG = "HDG"
)
// HDG is vessel heading (in degrees), deviation and variation with respect to magnetic north produced by any
// device or system producing magnetic reading.
// https://gpsd.gitlab.io/gpsd/NMEA.html#_hdg_heading_deviation_variation
//
// Format: $--HDG,x.x,y.y,a,z.z,a*hr<CR><LF>
// Example: $HCHDG,98.3,0.0,E,12.6,W*57
type HDG struct {
BaseSentence
Heading float64 // Heading in degrees
Deviation float64 // Magnetic Deviation in degrees
DeviationDirection string // Magnetic Deviation direction, E = Easterly, W = Westerly
Variation float64 // Magnetic Variation in degrees
VariationDirection string // Magnetic Variation direction, E = Easterly, W = Westerly
}
// newHDG constructor
func newHDG(s BaseSentence) (Sentence, error) {
p := NewParser(s)
p.AssertType(TypeHDG)
m := HDG{
BaseSentence: s,
Heading: p.Float64(0, "heading"),
Deviation: p.Float64(1, "deviation"),
DeviationDirection: p.EnumString(2, "deviation direction", East, West),
Variation: p.Float64(3, "variation"),
VariationDirection: p.EnumString(4, "variation direction", East, West),
}
return m, p.Err()
}
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