🔍 Key Concepts

• Danger signal under the Navigation Rules (sound and light) • Difference between distress signals and doubt / danger signals • Who may use the danger signal in a meeting, crossing, or overtaking situation

💭 Think About

• Think about when you use five or more short and rapid blasts on the whistle—what are you trying to communicate to the other vessel? • Is the danger signal restricted to one vessel’s role (stand-on or give-way), or can either vessel use it? • How is a danger signal different from the signals used to show a planned course change (port, starboard, astern)?

✅ Before You Answer

• Verify what five or more short and rapid blasts on the whistle actually mean in the Navigation Rules. • Check which signals are specifically listed as distress signals and see if the danger signal is on that list. • Confirm whether sound signals for course changes are the same as, or different from, the danger signal.