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Picton Harbours maintains two wave buoys in the Marlborough Sounds.

Wave buoys are located at:

Data is stored in a data warehouse and provided to partner organisations. Partner feeds are available as NMEA via a UDP stream or TCP server or as JSON.

The two buoys have different types of data and different update periods.

Northern Entrance

The sensor types are:

  • D = Linear Displacement

  • F = Frequency

  • A = Angular Displacement

The units are:

  • M = Meters

  • S = Seconds

  • D = Degrees

The sensor names are:

  • HSIG = Significant Wave Height

  • HMAX = Max Wave Height 1

  • HMAX2 = Max Wave Height 2

  • PDOM = Dominant Wave Period

  • PAVG = Average Wave Period

  • PMAX = Maximum Wave Period

  • MWD = Mean Wave Direction

  • PITCH = Pitch

  • ROLL = Roll

For NMEA service, two sentences are produced each minute. New data is provided with each transmission. Each sentence is followed by a CR/LF.

NMEA format sentence example, available on port 45052:

$WIXDR,D,0.134,M,HSIG,F,02.62,S,PDOM,F,02.62,S,PAVG,A,4.033,D,MWD*03
$WIXDR,D,0.234,M,HMAX,D,0.170,M,HMAX2,F,5.859,S,PMAX*5F

JSON format example:

{
  "sensor_id": "pcn.ne_buoy.svs_603.1",
  "timestamp": "2022-03-03T21:21:00Z",
  "measurement_id": "896d3d3c7a530aea77decebdfa86a64b",
  "hsig": 0.189,
  "pdom": 6.557,
  "pavg": 6.557,
  "mwd": 49.81,
  "hmax": 0.305,
  "hmax2": 0.24,
  "pmax": 11.13,
  "pitch": -1.028,
  "roll": 0.886
 }

Tory Entrance

The sensor types are:

  • D = Linear Displacement

  • F = Frequency

The units are:

  • M = Meters

  • S = Seconds

The sensor names are:

  • HMAX = Maximum Wave Height

  • HSIG = Significant Wave Height

  • PAVG = Average Wave Period

For NMEA service, one sentence is produced each minute. The same measurement is repeated for 30 minutes before an updated measurement is supplied. Sentences are followed by a CR/LF

NMEA format sentence example, available on port 45053:

$WIXDR,D,0.770,M,HMAX,D,0.532,M,HSIG,F,6.990,S,PAVG,*4C

JSON format example:

{
  "sensor_id": "pcn.tory_buoy.waverider.1",
  "timestamp": "2022-03-08T05:30:00Z",
  "measurement_id": "cea3bec026c0460e70e643d91964cdb7",
  "hsig": "0.748",
  "pavg": "7.040",
  "hmax": "1.310"
  }
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