The identification of a particular location is frequently required in international trade and transport to track the
movement of goods. The names of such locations are often spelt in different ways, and sometimes the same
location is given different names in different languages, which creates confusion and difficulties for data exchange.
The identification, in a unique and unambiguous way, of any place involved in international trade is essential, so
a coding system was developed for this purpose. The coding system is referred to as the “United Nations LOCODE”
(UN/LOCODE), and it is intended to cover ports and other locations for purposes of international trade data
interchange.

http://www.emsa.europa.eu/ssn-main/documents/item/1629-ssn-locodes-guidelines.html

The purpose of this document is to provide information and advice to SSN users on how and when to report MRS
notifications to SSN. The basic principle followed in the document is that the relevant resolution requirements
adopted by the Maritime Safety Committee (MSC) of the International Maritime Organisation (IMO) shall always be
respected and prevail.

http://www.emsa.europa.eu/ssn-main/documents/item/2069-mrs-guidelines-final-draft.html

The purpose of these Guidelines is to improve the quality and accuracy of dangerous and polluting goods (HAZMAT)
reporting in SafeSeaNet (SSN) through harmonisation.

http://www.emsa.europa.eu/ssn-main/documents/item/2298-ssn-guidelines-on-reporting-hazmat-v3-00.html

The purpose of these guidelines is to provide advice, recommendations and examples on what, who, how, where
and when to properly notify PortPlus messages through SSN in accordance with legal requirements and formats.
The guidelines also aim at enhancing the quality and accuracy of the reported information. These guidelines
address the PortPlus notification, which includes information on port call, waste and cargo residues, security,
actual time of arrival and departure notifications, as well as related exemptions.

http://www.emsa.europa.eu/ssn-main/documents/item/3050-guidelines-on-reporting-portplus-and-exemptions-in-ssn-v1-00.html