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SOLAS Consolidated edition 2001 Chapter II-2 regulation 20 and SOLAS amendments 2000 Chapter II-2 regulation 24 requires the use of fire control symbols on Fire Plans in accordance with IMO Resolution A.654(16).

SOLAS Consolidated edition 2004 Chapter II-2 regulation 15 as amended requires the use of fire control symbols in accordance with IMO Resolution A.952 (23) which refers to ISO 17631 and applies to vessels constructed after January 2000. Symbols to ISO17631 & IMO Resolution A.952 (23).

Vessels constructed before January 2004 may therefore continue to use symbols to Resolution A.654 (16) until such time as the Fire Plans require major modification or replacement. When this occurs, symbols to ISO 17631 should be used to compile the new plans regardless of the age of the vessel. 

IMO Resolution A.952 (23) symbols should be incorporated if Fire Control Plans are revised in its entirety, meaning re-developed and drawn, especially on vessels the keels of which are laid on or after 1 January 2004.

IMO Resolution A.654(16)

IMO Resolution A.952 (23) , ISO 17631,ISO 24409 

Non-standard IMO Signs