# The Air Navigation Order 2016, Paragraph 3: Position and size of marks – airships and free balloons


(1) The position and size of marks on airships and free balloons must be as specified in this paragraph.
(2) In the case of airships the marks must be—
(a) placed on each side of the airship; and
(b) placed horizontally either on the hull near the maximum cross-section of the airship or on the lower vertical stabiliser.
(3) In the case of free balloons, the marks must be in two places on diametrically opposite sides of the balloon.
(4) In the case of both airships and free balloons—
(a) the side marks must be so placed as to be visible from the sides and from the ground; and
(b) the height of the letters must be at least 50 centimetres.

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Source: https://www.legislation.gov.uk/uksi/2016/765/schedule/4/paragraph/3 (the official version)
Page: https://openlegislation.uk/air-navigation-order-2016/schedule-4/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.