21. GMDSS-equipped ships will be required to perform which of the following communications functions?

Distress alerting, MSI, SAR and On-scene communications & receipt of satellite alerts from other vessels.
SAR and On-scene communications, Bridge-to-Bridge and general radio communications, MSI and relay of satellite alerts from other vessels.
Bridge-to-Bridge and general radio communications, RDF of EPIRB homing signals, Distress alerting and MSI.
Transmit distress alerts, SAR and On-scene communications, MSI, Bridge-to-Bridge and general radio communications.

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