🔍 Key Concepts

• Digital Selective Calling (DSC) functions on MF/HF (8 MHz band, 8414.5 kHz is a DSC distress frequency) • Standard automatic responses of a GMDSS DSC controller to a Distress alert • How DSC equipment handles audible/visual alarms, printing, and data storage

💭 Think About

• When a DSC Distress alert is received, what must happen immediately to warn the operator, according to GMDSS principles? • Think about how a watchstander might review and retain the details of a distress call—what features of the equipment support this? • Which of the listed behaviors (alarm, printout, data directory) are normal/typical for a modern MF/HF DSC controller, and are they mutually exclusive or can they all occur together?

✅ Before You Answer

• Verify what actions are mandatory when a DSC Distress alert is received (especially the need to alert the operator). • Check if MF/HF DSC equipment is normally capable of printing or logging distress message particulars for later review. • Confirm whether DSC equipment keeps a data record/log of received distress alerts in an internal directory or similar function.