🔍 Key Concepts

• MF distress and calling frequencies and which are used for DSC (digital) vs radiotelephony (voice) • The standard procedure for canceling a false or inadvertent distress alert under GMDSS on MF • The difference between sending a new DSC alert and making a cancellation announcement by voice

💭 Think About

• First, identify which of the listed frequencies is the voice distress frequency associated with MF, rather than the DSC (digital) frequency. • Ask yourself: after a false DSC distress alert, do the procedures call for another DSC transmission, or a radiotelephony announcement to all stations? • Consider which option best ensures that all ships and coast stations that received the false alert will understand it was an error.

✅ Before You Answer

• Verify which MF frequency is designated for radiotelephony distress traffic (voice) in the 2 MHz band. • Check whether standard GMDSS practice is to cancel false alerts by DSC or by voice announcement on the associated distress frequency. • Confirm that the chosen option uses voice on the correct MF distress frequency, not on a routine working or DSC-only channel.