anchor.diff:  The 'shipCourseText' returns one of the following values: "not moving", "NE", "E", "SE", "S", "SW", "W", "NW", "N", "unknown".
   The 'shipSpeedRangeInKnots' returns one of the following values: "0", "1-5", "6-10", "11-15", "16-20", "21-25", "26-30", "31-35", "36-40", ">40", "unknown".
   
  +*Gap filling*
  +
  +GapFilling allows to gap fill missing observations with forecast data from MOSI for following parameters: 
  ++ airPressureAtSeaLevelInHectoPascal
  ++ airTemperatureInCelsius
  ++ airTemperatureInFahrenheit
  ++ airTemperatureInKelvin
  ++ dewPointTemperatureInCelsius
  ++ dewPointTemperatureInFahrenheit
  ++ dewPointTemperatureInKelvin
  ++ effectiveCloudCoverInOkta
  ++ relativeHumidityInPercent
  ++ totalCloudCoverInOkta
  ++ windDirectionInDegree
  ++ windSpeedInKilometerPerHour
  ++ windSpeedInMeterPerSecond
  ++ windSpeedInMilesPerHour 
  +
  +GapFilling is applied always when requested, regardless if any of observations are available.
  +GapFilling is available only for PT0S period. 
  +
   *Fields mapping*
   
   Common names of filed which can be included in all periods: meteoGroupStationId, meteoGroupStationName, stationLocation, stationTimeZoneName
  
positive.code:     + observedUntil: `2016-10-15T09:00:00Z` (string, optional) - ISO8601 timestamp notation, means incl. this timestamp; always provide a time offset, e.g. 'Z' for UTC; optional: a request may provide correct offset (so that server can convert to UTC).
      + observedPeriod: `PT0S,PT1H,PT3H,PT12H,PT24H` (string, required) - comma separated list of periods to be retrieved. use ISO8601 time duration notation. PT0S refers to observations at a moment in time. PT1H applies one hour aggregation.
      + timeZone: `Europe/Paris` (string, optional) - Time zone refers to the IANA Time Zone Database (TZDB).
  
  ### Search for observation data for multiple given locations [GET]
  
  
negative.code: 
  Every endpoint may add one or more response parameters in the future.
  Clients should ignore unknown parameters, to avoid technical issues.
  
  # Group Observation
  
  