🔍 Key Concepts

• Annex IV – Distress Signals of the Navigation Rules (International & Inland) • Standardized time intervals used internationally for audible distress signals • The idea that a distress signal must be repeated frequently enough to be clearly recognized as an emergency, not a ceremonial or isolated event

💭 Think About

• Ask yourself: Which time spacing would most clearly say, "Something is wrong RIGHT NOW" rather than "this is an occasional or ceremonial shot"? • Think about other standard distress patterns (like SOS in Morse) – are they slow and rare, or relatively frequent and repetitive? • Consider which interval is actually written in Annex IV as the guideline for firing guns or other explosive signals in distress.

✅ Before You Answer

• Look up Navigation Rules, Annex IV – Distress Signals, and find the line that mentions a gun or other explosive signal. • Confirm the exact time interval Annex IV pairs with that specific method of distress signaling. • Eliminate any options that are clearly too slow to attract urgent attention or too fast to be practical for loading and firing each round.