🔍 Key Concepts

• VHF calling procedures in the maritime mobile service • The idea of avoiding congestion and interference on distress and calling frequencies (like Channel 16) • Standard minimum interval between repeated calls when no reply is received

💭 Think About

• Think about why there is a recommended waiting period before repeating a call on a busy channel like 16. What problem is this trying to prevent? • Is the interval very short (so you might clutter the channel), very long (so communication is delayed), or a balanced, standard time used in many radio procedures? • Recall typical radio-telephone procedures from GMDSS/Standard Marine Communication Phrases: how long do operators usually pause before trying again?

✅ Before You Answer

• Verify what standard procedure says about how many times you may call in one attempt and how long to wait between attempts • Consider which of the options seems like a commonly used, practical standard interval in radio procedures, not just a random time • Ask yourself which time period best balances keeping the channel clear with not delaying communication too much