(Ref: IMO Resolution A 648 (16)
The alphabetical reference letters in the above listing are from A.648(16).
The letters do not follow the complete alphabetical sequence as certain letters are used to designate information required for other standard reporting formats, e.g. those used to transmit route information
Message prefixed G ... 101112909142
Once the ship has transmitted the initial report, all parties contacted must be regularly informed as the incident develops.
These reports should include the following, if available: