Which frequencies and modes are allocated...

Question 1 / 2707066636eec28f7522a1c51c3e0

Question 1 of 2707066636eec28f7522a1c51c3e0

Which frequencies and modes are allocated for distress alerting in GMDSS?

Question 1 of 27070

Which frequencies and modes are allocated for distress alerting in GMDSS?

🔍 Key Concepts

• GMDSS distress alerting uses several different technologies (VHF/MF/HF DSC, satellite EPIRBs, and Inmarsat). • The question asks about frequencies and modes allocated for distress alerting, not general communications. • Each option lists a different system or band used within GMDSS.

💭 Think About

• Ask yourself: Does GMDSS rely on only one of these systems, or multiple, to ensure redundancy for distress alerting? • Consider whether EPIRBs on 406 MHz and Inmarsat distress services are also part of the official GMDSS distress alerting system. • Think about which answer choice best reflects the full set of primary distress alerting methods required under GMDSS.

✅ Before You Answer

• Verify which DSC (Digital Selective Calling) channels/frequencies are officially designated for distress alerting on VHF and MF/HF. • Confirm that 406 MHz EPIRBs are specifically allocated for distress alerting to the COSPAS-SARSAT system. • Check whether the 1626.5–1645.5 MHz band is associated with Inmarsat ship earth stations for distress and safety communications under GMDSS.

Question 1 of 27070

Which frequencies and modes are allocated for distress alerting in GMDSS?

Channel 70 DSC plus six (6) MF/HF DSC frequencies

406 MHz via EPIRB

1626.5-1645.5 MHz via INMARSAT

All of the above

Question 1 / 2707066636eec28f7522a1c51c3e0

Question 1 of 2707066636eec28f7522a1c51c3e0

Which frequencies and modes are allocated for distress alerting in GMDSS?

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Question 1 of 27070

Which frequencies and modes are allocated for distress alerting in GMDSS?