Unified Interpretations are adopted resolutions on matters arising from implementing the requirements of IMO Conventions or Recommendations. Such adopted resolutions can involve uniform interpretations of Convention Regulations or IMO Resolutions on those matters which in the Convention are left to the satisfaction of the Administration or vaguely worded.
Interpretations are circulated to Administrations concerned or are sent to IMO for information, as appropriate.
- IACS, as an international Non-Governmental Organization having observer status at IMO, works in co-operation with IMO in order to endeavour that regulations developed at IMO are clear, unambiguous and can easily be applied without the need of interpretations.
- However, interpretations may still be needed in cases where IMO regulations contain only functional requirements, allow alternative solutions to prescriptive requirements, are left to the satisfaction of Administrations or are generally or vaguely worded.
- The following Unified Interpretations (UIs) have been developed by IACS to assist the unified implementation of IMO regulations falling in the above-mentioned cases. It should be noted that the development of IACS Unified Interpretations (UIs) is not aiming at introducing additional requirements but at achieving uniform application of IMO regulations.
- IACS UIs are to be applied by IACS Societies to ships whose flag Administrations have not issued definite instructions on the interpretation of the IMO regulations concerned, in the course of statutory certification on behalf of those flag Administrations.
The technical backgrounds (development histories) of Unified Interpretations since 2004 can be found by following this link.
A list of the IACS working groups responsible for each Unified Interpretation may be found here.
UI MPC4 Deleted
UI MPC4 Discharge of segregated ballast (Annex I, Regulation 18(6)) Deleted August 2015
UI MPC5 Rev1 CLN
UI MPC7 Deleted
UI MPC7 Hydrostatic Balance Loading Deleted Apr 2010, since Hydrostatic Balance Loading is no longer acceptable under MARPOL Annex I.
UI MPC8 Deleted
UI MPC8 Interpretation of “installed on board” (MARPOL 73/78, Annex VI/16(2)(a)) Deleted in Oct 2005
UI MPC9 Rev1 CLN
UI MPC10 Rev1 CLN
UI MPC10 Endorsement of Certificates with the Date of Completion of the Survey on which they are Based - Rev.1, Nov. 2005
UI MPC11 Rev2 CLN
UI MPC12 Rev2 Corr1 CLN
UI MPC13 Deleted
UI MPC13 Annex VI of MARPOL 73/78 Regulation 2 (4) Deleted Nov 2013.
UI MPC14 Rev1 Corr1 CLN
UI MPC15 Deleted
UI MPC15 Annex VI of MARPOL 73/78 Regulation 9 (4) (b) Deleted Nov 2013.
UI MPC16 Deleted
UI MPC16 Annex VI of MARPOL 73/78 Regulation 13 (1)(a)(i) Deleted 1 November 2015.
UI MPC17 Deleted
UI MPC17 Annex VI of MARPOL 73/78 Regulation 13 (1) (a) (ii) Deleted Nov 2013.
UI MPC18 Deleted
UI MPC18 Annex VI of MARPOL 73/78 Regulation 13 (1) (b) (i) Deleted Nov 2013.
UI MPC19 Deleted
UI MPC19 Annex VI of MARPOL 73/78 Regulation 13 (1) (c) Deleted Nov 2013.
UI MPC20 Rev1 CLN
UI MPC21 Deleted
UI MPC21 Annex VI of MARPOL 73/78 Regulation 13 (2) (a) (iii) Deleted Nov 2013.
UI MPC22 Deleted
UI MPC22 Annex VI of MARPOL 73/78 Regulation 13 (3) (a) Deleted Nov 2013.
UI MPC23 Deleted
UI MPC23 Annex VI of MARPOL 73/78 Regulation 13 (3) (b) Deleted Nov 2013.