Rule 20 — Application

(a) Rules in this Part shall be complied with in all weathers.

(b) The Rules concerning lights shall be complied with from sunset to sunrise and during such times no other lights shall be exhibited, except such lights as cannot be mistaken for the lights specified in these Rules or do not impair their visibility or distinctive character, or interfere with the keeping of a proper look-out.

(c) The lights prescribed by these Rules shall, if carried, also be exhibited from sunrise to sunset in restricted visibility and may be exhibited in all other circumstances when it is deemed necessary.

(d) The Rules concerning shapes shall be complied with by day.

(e) The lights and shapes specified in these Rules shall comply with the provisions of Annex I to these Regulations.

MSN 1781 (M+F): Rules text stated on the document as amended through IMO Res A.910(22); read with MSN 1781 (M+F) Amendment 3 (21 Nov 2023, current — replaces Amendment 2; scope-only change for the Merchant Shipping (Watercraft) Order 2023). Per Amendment 2 Appendix 2, the only later wording changes are Annex IV (A.1004(25)) and new Part F Rules 39-41 (A.1085(28)).

Contains public sector information reproduced under the Open Government Licence v3.0. Source: MSN 1781.

Independent preparatory study aligned to the MCA OOW (Yachts <3000 GT) oral examination syllabus. Not an MCA-approved course and confers no credit toward a Certificate of Competency.