COLREGS Rule 23 | Power-Driven Vessels Underway & Navigation Lights

Rule 23 Explained | Power-Driven Vessels Underway & Navigation Lights COLREGs Rule 23 explains the navigation lights that **power-driven vessels must display when underway**. This rule is the foundation for identifying merchant ships at night and is one of the most commonly tested topics in oral exams, written assessments, and bridge watchkeeping. In this video, Rule 23 is explained clearly with vessel-length logic, practical bridge examples, and exam-friendly reasoning — making it easy to remember and apply at sea. Perfect for: • Merchant Navy cadets • Deck officers preparing for oral exams • OOWs handling night navigation • Anyone revising COLREGs for exams or promotions ⚓ What You’ll Learn • Mandatory lights for power-driven vessels underway • When one or two masthead lights are required • Additional light requirements for vessels over 50 m • Rules for small power-driven vessels • Identification logic used during watchkeeping • Common oral-exam questions with clear answers Part of the complete COLREGs training series — simple, visual, and exam-focused. ⚓ 📌 CHAPTERS 00:00 – Introduction 00:20 – What Rule 23 Covers 01:10 – Required Lights for PDV Underway 01:55 – Second Masthead Light Requirements 02:35 – Vessels Over 50 m 03:15 – Small Power-Driven Vessels 03:55 – Practical Examples & Orals Questions 04:40 – Summary 🌐 Connect with Sailor Rider YouTube:    / @sailor_rider   Facebook:   / 19imzynlrp   Instagram: https://instagram.com/sailor_rider?ig... Threads: https://www.threads.com/@sailor_rider Tags colregs rule 23 explained power driven vessel lights navigation lights power driven vessel masthead light requirements colregs two masthead lights rule vessels over 50m lights small power driven vessel lights merchant navy lights training deck officer oral exam colregs night navigation vessel lights bridge watch light identification colregs exam preparation seamanship lights rules maritime navigation lights rule 23 orals preparation #COLREGs #NavigationLights #PowerDrivenVessel #MerchantNavy #MaritimeSafety