Navigation instruments (function 12)

Wind, heading, speed, destination and time instruments. Published only (no commands).

• Wind reference enum: magnetic-north, real-north, boat (string only, no Code).

Published

device/12/<i>/relative-wind and device/12/<i>/real-wind

metadata adds counter; expireAfterSec: 5. Same structure.

data field	Type	Unit	Description
reference	string	—	Angle reference (enum)
speed	number (1 dec)	kn	Wind speed
angle	number (1 dec)	°	Wind angle (signed)
temperatureAir	int	°C	Air temperature

{
  "data": {
    "reference": "boat",
    "speed": 12.4,
    "angle": -35.2,
    "temperatureAir": 18
  },
  "metadata": {
    "rxdate": "2026-06-17T14:30:45.123Z",
    "rxTimestamp": 1781793045,
    "expireAfterSec": 5,
    "counter": 7
  }
}

device/12/<i>/cap

metadata adds counter; expireAfterSec: 5.

data field	Type	Unit	Description
magnetic	number (1 dec)	°	Magnetic heading
real	number (1 dec)	°	True heading (signed)

device/12/<i>/speed

metadata adds counter; expireAfterSec: 5.

data field	Type	Unit	Description
surface	number (1 dec)	kn	Speed through water
ground	number (1 dec)	kn	Speed over ground (signed)
temperatureWater	int	°C	Water temperature

device/12/<i>/destination-distance

expireAfterSec: 30.

data field	Type	Unit	Description
id	int	—	Waypoint id
distance	int	m	Distance to destination

device/12/<i>/destination-time

expireAfterSec: 30.

data field	Type	Unit	Description
id	int	—	Waypoint id
days	int	days	ETA day component
seconds	int	s	ETA seconds component
iso	string	—	ETA as UTC YYYY-MM-DDTHH:MM:SSZ

device/12/<i>/time

metadata adds counter; expireAfterSec: 2.

data field	Type	Unit	Description
days	int	days	Day component
seconds	int	s	Seconds component
iso	string	—	UTC YYYY-MM-DDTHH:MM:SSZ

{
  "data": {
    "magnetic": 182.3,
    "real": 179.8
  },
  "metadata": {
    "rxdate": "2026-06-17T14:30:45.123Z",
    "rxTimestamp": 1781793045,
    "expireAfterSec": 5,
    "counter": 2
  }
}

mosquitto_sub -h 127.0.0.1 -t 'device/12/+/#' -v