Although it is possible for an observing station to be associated with more than one WIGOS station identifier, it is desirable to associate as few identifiers as possible with an observing station. Therefore, if an observing station is already associated with a WIGOS identifier, or is associated with an identifier issued by a WMO or partner programme, an additional WIGOS station identifier should not be issued. WIGOS Identifiers for observing stations The following table lists the values of Issuer of Identifier that have been allocated for use. Issuer of Identifier Range of Issuer of Identifier Category of issuer Method of allocating Procedures for issuing Issue Number and Local Identifier 0 Reserved for internal use by OSCAR allocates the value. Determined by OSCAR. 1-9999 Member State or territory for which there is an ISO 3166-1 numeric country code ISO 3166-1 three digit numeric country code (by convention leading zeroes are not shown in WIGOS Identifiers). See and click on "Officially assigned codes" (on the left of the screen). Issuer identifies its own procedures. Further guidance is available in the section . Member State or territory for which there is no ISO 3166-1 numeric country code WMO Secretariat allocates an available number on request. Issuer identifies its own procedures. Further guidance is available in the section . Reserved for future use To be determined. To be determined. Identifiers in the ranges 20000-21999 and 22000-39999 are intended only to be used to allocate WIGOS identifiers for observing facilities that had one or more pre-existing identifiers.
number (SI) = 0 Any other positive number: to distinguish between different observing facilities that used the station identifier in the past. IIiii (with leading zeroes). Example: station 60351 would be represented by World Weather Watch land station with sub-index number (SI) = 1 0: station defined in WMO-No. 9 Volume A on 1 July 2016. Any other positive number: to distinguish between different observing facilities that used the station identifier in the past. Use the block number (II) and the station number (iii) as a single five digit number IIiii (with leading zeroes). Example: upper air station 57816 would be represented by 20002 World Weather Watch Marine Platform (moored or drifting buoy, platform, etc.) 0 - platform for the identifier was in use on 1 July 2016. Any other positive number - to distinguish between different platforms that used the same identifier at different times. Use the region/platform number combination A1bwnbnbnb Examples: the data buoy would be represented by The World Weather Watch list of data buoys lists two buoys with identifier 13001. The buoy most recently used at the time WIGOS station identifiers were
20005 AMDAR aircraft identifier 0 - aircraft most recently issued the identifier on 1 July 2016. Any number: to distinguish between different aircraft that used the same aircraft identifier at different times. Aircraft identifier. Example: aircraft EU0246 would be represented by 20006 ICAO airfield identifiers 0 - airfield most recently allocated the identifier on 1 July 2016. Any other positive number: to distinguish between airfields that used the same airfield identifier at different times. ICAO airfield identifier. Example: Geneva airport (LSSG) would be represented by 20007 Ship IMO number (hull number) 0 - ship to the IMO number was most recently allocated on 1 July 2016. Any other positive number: to distinguish between ships that Ship identifier. Example: ship 9631369 would be represented by