🔍 Key Concepts

• Power-driven vessel lighting requirements for vessels 50 meters or more in length (International & Inland) • Difference between masthead lights, stern light, and all-round lights • Special combinations of red over green or green over white and what types of vessels they indicate

💭 Think About

• First decide what basic navigation lights a power-driven vessel of 75 meters (over 50 meters) must show at night when underway, not towing and not restricted in any way. • Compare the requirements for masthead lights on vessels under 50 meters versus 50 meters and above—how many masthead lights and where are they placed? • Think about what vessel types are indicated by a red light over a green light, and whether a simple power-driven vessel underway would qualify as that type.

✅ Before You Answer

• Verify the minimum required lights for a power-driven vessel underway over 50 meters: number of masthead lights, sidelights, and stern light. • Check whether an all-round white light at the stern is a standard requirement for a large power-driven vessel, or if a stern light (arc 135°) is used instead. • Confirm what vessel displays red over green and whether a 75-meter power-driven vessel, not otherwise restricted, would use that combination.