🔍 Key Concepts

• MF-HF DSC Distress Alert content per ITU/USCG (what data fields are ALWAYS included) • Difference between DSC digital alert and voice (radiotelephony) mayday procedures • Role and purpose of the MMSI (Maritime Mobile Service Identity) and follow‑on communications frequency/mode in a distress call

💭 Think About

• List, in your own words, what information a DSC distress alert MUST contain before any voice traffic begins, and in what logical order it would be processed by a rescue authority • Ask yourself which items in the options clearly belong to the older voice mayday format rather than to an automated DSC digital alert • Consider whether the alert first needs to identify WHO is in distress, WHAT priority it is, WHERE/WHEN it is, and then HOW further communications will take place—what logical order would those come in for an automatic system?

✅ Before You Answer

• Check which choices correctly start with digital identifiers used by DSC (e.g., MMSI or distress code) rather than voice‑only techniques like tones or spoken names • Verify which options include BOTH position & time AND some indication of how to continue communications (frequency/emission) • Eliminate any answer that uses procedures that belong only to radiotelephony mayday voice calls and not to DSC, such as a "string of dots" sent by voice to stop a scanner