1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
|
package nmea
const (
// TypeVLW type of VLW sentence for Distance Traveled through Water
TypeVLW = "VLW"
)
// VLW - Distance Traveled through Water
// https://gpsd.gitlab.io/gpsd/NMEA.html#_vlw_distance_traveled_through_water
//
// Format: $--VLW,x.x,N,x.x,N*hh<CR><LF>
// Format (NMEA 3+): $--VLW,x.x,N,x.x,N,x.x,N,x.x,N*hh<CR><LF>
// Example: $IIVLW,10.1,N,3.2,N*7C
// Example: $IIVLW,10.1,N,3.2,N,0,N,0,N*7C
type VLW struct {
BaseSentence
TotalInWater float64 // Total cumulative water distance, nm
TotalInWaterUnit string // N = Nautical Miles
SinceResetInWater float64 // Water distance since Reset, nm
SinceResetInWaterUnit string // N = Nautical Miles
TotalOnGround float64 // Total cumulative ground distance, nm (NMEA 3 and above)
TotalOnGroundUnit string // N = Nautical Miles (NMEA 3 and above)
SinceResetOnGround float64 // Ground distance since reset, nm (NMEA 3 and above)
SinceResetOnGroundUnit string // N = Nautical Miles (NMEA 3 and above)
}
// newVLW constructor
func newVLW(s BaseSentence) (Sentence, error) {
p := NewParser(s)
p.AssertType(TypeVLW)
vlw := VLW{
BaseSentence: s,
TotalInWater: p.Float64(0, "total cumulative water distance"),
TotalInWaterUnit: p.EnumString(1, "total cumulative water distance unit", DistanceUnitNauticalMile),
SinceResetInWater: p.Float64(2, "water distance since reset"),
SinceResetInWaterUnit: p.EnumString(3, "water distance since reset unit", DistanceUnitNauticalMile),
}
if len(p.Fields) > 4 {
vlw.TotalOnGround = p.Float64(4, "total cumulative ground distance")
vlw.TotalOnGroundUnit = p.EnumString(5, "total cumulative ground distance unit", DistanceUnitNauticalMile)
vlw.SinceResetOnGround = p.Float64(6, "ground distance since reset")
vlw.SinceResetOnGroundUnit = p.EnumString(7, "ground distance since reset unit", DistanceUnitNauticalMile)
}
return vlw, p.Err()
}
|
