🔍 Key Concepts

• Maneuvering and warning signals in the Navigation Rules (International & Inland) • Difference between one, two, and three short blasts on the whistle or maneuvering light • Distinction between "in doubt" sound signals and overtaking/altering course signals

💭 Think About

• Ask yourself: when do vessels normally use maneuvering lights instead of just sound signals? • Think about what one and two short blasts mean in a meeting situation; how does three short blasts logically fit with those? • Which choice sounds like a special situation related to doubt or danger, and which sound/light signals are usually used for that?

✅ Before You Answer

• Verify in the Navigation Rules what one, two, and three short blasts mean under both International & Inland Rules • Check which signal is specifically assigned to operating astern propulsion rather than engine speed or overtakings • Confirm which signal is used when "in doubt as to the other vessel's actions" (often linked with five short and rapid blasts, not three)