🔍 Key Concepts

• GMDSS Distress alerting and follow-on communications procedures • Meaning of emission designator J3E in ITU radio regulations (type of transmission and typical use) • Association between a DSC distress alert frequency and its paired follow-on traffic frequency

💭 Think About

• What mode and type of communication does J3E describe: digital (like SITOR/NBDP) or analog radiotelephony? • After a DSC distress alert, on what kind of frequency/mode is the voice distress traffic normally conducted? • Look at each option and ask: does it match the requested follow‑on mode (J3E) and the same band where the DSC alert was received?

✅ Before You Answer

• Verify what J3E stands for (single‑sideband radiotelephony) versus the designation used for SITOR/NBDP • Check which channel or frequency is normally used for DSC watchkeeping and which is used for voice distress traffic • Confirm that the correct action is to maintain a continuous watch on the appropriate follow‑on traffic frequency in the requested mode (J3E), not on the DSC calling frequency itself