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 GC19 New
UI GC19 External surface area of the tank for determining sizing of pressure relief valve (paragraph 188.8.131.52 and figure 8.1) New Aug 2017.
Note: UI GC19 will come into force on 1 January 2018
Interpretations of the IGF Code
UI GF1 New
High Speed Craft Code
UI HSC1 New
UI HSC1 New 1996
UI HSC2 New
UI HSC2 New 1996
UI HSC3 New
UI HSC3 New 1996
UI HSC4 New
UI HSC4 New 1997
UI HSC5 New
UI HSC5 New 1997
UI HSC6 New
UI HSC6 New 1997
UI HSC7 Rev1 CLN
UI HSC8 New
UI HSC8 New July 2012
UI HSC10 New
UI HSC10 New May 2016
Load Line Convention
UI LL1 Rev1 CLN
UI LL1 Application (Article (4)) - Rev.1 July 2008
UI LL2 Rev1 CLN
UI LL2 Depth for freeboard (Regulation 3(6)) - Rev.1 July 2008
UI LL3 Rev1 CLN
UI LL3 Superstructure (Regulation 3 (10)(b)) - Rev.1 July 2008
UI LL4 Rev1 CLN
UI LL4 Details of marking (Regulation 8) - Rev.1 July 2008
UI LL5 Rev1 CLN
UI LL5 Doors (Regulation 12) - Rev.1 July 2008 Clean