{
  "context": "vessels.self",
  "subscribe": [
    {
      "path": "navigation.speedThroughWater",
      "period": 1000,
      "format": "delta",
      "policy": "ideal",
      "minPeriod": 200
    },
    {
      "path": "navigation.logTrip",
      "period": 10000
    }
  ]
}