🔍 Key Concepts

• Rule 27 – Vessels Not Under Command or Restricted in Their Ability to Manoeuvre (Navigation Rules) • Meaning of the color red vs white in light combinations (danger/obstruction vs general masthead/working lights) • Standard vertical light patterns for special conditions (e.g., not under command, restricted in ability to maneuver, constrained by draft)

💭 Think About

• Think about what combination of colors is traditionally used to show a vessel that must be given extra room because her movements are limited by her work or condition. • Compare the light pattern for not under command with that for restricted in ability to maneuver—which one uses only one color, and which uses a combination? • Which option looks like a "warning plus normal operation" combination, rather than a condition where the vessel has completely lost the ability to keep out of the way?

✅ Before You Answer

• Review the exact wording of Rule 27(b) on restricted in ability to maneuver lights in the Navigation Rules. • Confirm whether the required pattern is all one color or a distinct color–color–color combination shown vertically. • Eliminate any choices that match a different known status, such as vessel not under command (also in Rule 27).