Article 6 Nationality and registration marks
A hovercraft registered in the United Kingdom shall not be used unless—
it bears prominently and clearly painted or affixed to the craft its nationality and registration marks; and
the nationality and registration marks together with the name and address of the registered owner are engraved on a fire proof metal plate affixed in a prominent position inside the hovercraft near an entrance.
The nationality mark of a hovercraft registered in the United Kingdom shall be the capital letters “GH” in Roman characters and the registration mark shall be a group of four digits assigned by the Secretary of State on the registration of the hovercraft. The letters and digits shall be without ornamentation and a hyphen shall be placed between the nationality mark and the registration mark.
The nationality and registration marks of a hovercraft shall be used as the sole means of identification of the craft by radio.