🔍 Key Concepts

• Digital Selective Calling (DSC) procedures for Routine, Safety, and Distress traffic • The specific purpose of Channel 70 (CH-70) in the GMDSS system • How a Routine DSC call is normally initiated from the radio’s menu/keypad, versus how a Distress alert is initiated

💭 Think About

• Which functions on a DSC radio are reserved for Distress only, and which are used for normal day‑to‑day calling? • Think about how you would select a specific vessel or coast station and call type (Routine, Safety, etc.) on a modern DSC set—do you use a dedicated emergency button, or menu/key selections? • What is CH‑70 actually used for in DSC: is it only for distress, or also for Routine calls sent digitally?

✅ Before You Answer

• Identify which choice describes a method used only for Distress alerts rather than Routine calls. • Confirm that CH‑70 is the DSC calling/alerting channel and is used for digital calls of various priorities, not only distress. • Look for the option that describes using the radio’s menus or soft keys to set up a Routine DSC call, including call type and called MMSI.