{
  "context": "vessels.urn:mrn:imo:mmsi:234567890",
  "updates": [
    {
      "meta": [
        {
          "path": "environment.depth.belowTransducer",
          "value": {
            "description": "Depth below Transducer",
            "units": "m",
            "timeout": 2.5,
            "zones": [
              {
                "upper": 5.0,
                "state": "warn",
                "message": "Shallow water" 
              }
            ],
            "warnMethod": ["sound"]
          }
        }
      ]
    }
  ]
}