All vessels
Rule Reference
Rule 28: a vessel constrained by her draught may, in addition to Rule 23 lights, exhibit three all-round red lights in a vertical line, or a cylinder.
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.