BOTH INTERNATIONAL & INLAND You are approaching another vessel at night. You can see both red and green sidelights and, above the level of the sidelights, three white lights in a vertical line. Which vessel is required to have these lights?
• Navigation Rules – Lights and Shapes in Part C (Lights and Shapes) • Meaning of three white masthead lights in a vertical line for power-driven/towing vessels • Difference between lights for towing, trawling, not under command, and dredging
• Think about which type of vessel would show multiple white masthead lights in a vertical line, in addition to red/green sidelights, when underway at night. • Recall which vessels display only red lights, or red over red, versus those that show green over white or other fishing combinations. • Ask yourself: when a tow gets longer, what changes in the towing vessel’s masthead light configuration compared to a shorter tow?
• Verify in the lights and shapes table what three white masthead lights in a vertical line indicates. • Check which of the listed vessel types would always show red/green sidelights when making way, and which might show special all‑round red/green lights instead. • Confirm how the lighting changes for a towing vessel when the tow is more than 200 meters versus less than 200 meters.
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