All vessels
Rule Reference
Rule 25(b): in a sailing vessel of less than 20 m the lights prescribed in paragraph (a) may be combined in one lantern carried at or near the top of the mast.
Top-Down View
Tap any light dot to see its COLREGS sector and rule.
In the Navitime app
This is just a fraction of what the app offers
Download Navitime free on iOS and Android for the full Advanced Navigation book collection, adaptive quizzes, flashcards, and mock exams — all fully offline.