This section explains how to allocate issuers of identifiers for station identifiers associated with
WMO Programmes.

Observing Programmes with an international system for assigning station identifiers

defines the issuer of identifier values in the range 20000–21999 to be used for WIGOS
station identifiers. This range is used to ensure that observing facilities that have pre-existing
station identifiers can be allocated a WIGOS station identifier in a way that retains an association
with the pre-existing identifier. Any new observing facility will be given an identifier within the
range allocated to the Member operating the observing facility.

Observing Programmes with an international system for assigning station identifiers

Table: Issuer of identifier values in the range 20000-21999

Issuer of Identifier values	Category of station identifier	Issue Number'	Local Identifier
20000	World Weather Watch land station with sub-index number (SI) = 0	0: station defined in Weather Reporting 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: station 60351 would be represented by 0-20000-0-60351
20001	World Weather Watch land station with sub-index number (SI) = 1	0: station defined in Weather Reporting 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 0-20001-0-57816
20002	World Weather Watch Marine Platform (moored or drifting buoy, platform, etc.)	0: platform for which 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 59091 would be represented by 0-20002-0-59091. 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 introduced is allocated 0-20002-0-13001 and the second is issued identifier 0-20002-1-13001.
20003	Ship identifier based on the International Telecommunications Union call sign.	0: ship allocated the identifier most recently on 1 July 2016. Any other positive number: to distinguish between different ships that used the same ship identifier at different times.	Ship call sign. Example: the (now obsolete) weather ship C7R would be represented by 0-20003-0-C7R.
20004	Ship Identifier - issued nationally	0: ship to which the identifier was most recently allocated on 1 July 2016. Any other positive number: to distinguish between different ships that used the same ship identifier at different times.	Ship identifier. Example: the fictitious ship XY123AB would be represented by 0-20004-0-XY123AB.
20005	AMDAR aircraft identifier	0: aircraft to which the identifier was most recently issued the identifier on 1 July 2016. Any other positive number: to distinguish between different aircraft that used the same aircraft identifier at different times.	Aircraft identifier. Example: aircraft EU0246 would be represented by 0-20005-0-EU0246.
20006	ICAO airfield identifiers	0: airfield to which the identifier was most recently allocated 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 0-20006-0-LSGG.
20007	International Maritime Organization (IMO) ship number (hull number)	0: ship to which the IMO number was most recently allocated on 1 July 2016. Any other positive number: to distinguish between ships that used the same IMO identifier at different times.	Ship identifier. Example: ship 9631369 would be represented by 0-20007-0-9631369.
20008	Global Atmosphere Watch (GAW) Identifier	0: station to which the GAW identifier was most recently allocated on 1 July 2016.	Three character GAW identifier. Example: Jungfraujoch JFJ would be represented by 0-20008-0-JFJ.
20009	WMO Satellite Programme	0	Three digit satellite identifier with leading zeroes (recorded in Common Code Table C-7 of yjr Manual on Codes (WMO-No. 306) Volume I.1) Example: METEOSAT 10 (with identifier 057) would be represented by 0-20009-0-057.
20010	WMO Weather Radar	0	Unique key used to cross-reference information about a single radar within the WMO radar database ('this key was not previously published) Example: Station with record number 121 would be represented by 0-20010-0-121.
20011	AIREP aircraft identifier	0: aircraft most recently issued the identifier on 1 July 2016. Any other positive number: to distinguish between different aircraft that used the same aircraft identifier at different times.	Aircraft identifier. Example: aircraft ABCDE would be represented by 0-20011-0-ABCDE.
20012	ADS-C aircraft identifier	0: aircraft most recently issued the identifier on 1 July 2016. Any other positive number: to distinguish between different aircraft that used the same aircraft identifier at different times.	Aircraft identifier. Example:aircraft UVWXY would be represented by 0-20012-0-UVWXY.
20013	TAMDAR aircraft identifier	0: aircraft most recently issued the identifier on 1 July 12016. %Any other number: to distinguish between different aircraft that used the same aircraft identifier at different times.	Aircraft identifier. Example: aircraft UU123 would be represented by 0-20013-0-UU123.
20014	AFIRS aircraft identifier	0: aircraft most recently issued the identifier on 1 July 12016. %Any other positive number: to distinguish between different aircraft that used the same aircraft identifier at different times.	Aircraft identifier. Example: aircraft AB123 would be represented by 0-20014-0-AB123.
20015	IAGOS aircraft identifier	0: aircraft most recently issued the identifier on 1 July 12016. %Any other number: to distinguish between different aircraft that used the same aircraft identifier at different times.	Aircraft identifier. Example: aircraft EG567 would be represented by 0-20013-0-EG567.
20016-21999	Reserved for future use.	To be determined.	To be determined.

Observing Programmes that did not have a systematic international system for station identification

The following observing programmes did not have a pre-existing international system for assigning station identifiers and have not been allocated Issuer of Identifiers. Members operating the stations supporting these observing programmes should allocate WIGOS identifiers using their national system.

Sea level network. In the past, station identifiers have been issued according to national conventions. In cases where the identifier of another WMO Programme has been used (for example a land station identifier), the WIGOS identifier corresponding to that identifier should be used.

Tsunamometer network. In the past, station identifiers have been issued according to national conventions. In cases where the identifier of another WMO Programme has been used (for example a land station identifier), the WIGOS identifier corresponding to that identifier should be used.