Distress relays sent by other stations
When a Coast Station or another vessel, has received,
and acknowledged a DSC distress alert it may transmit a distress alert
relay to other vessels in the immediate area.
Distress relays sent from other stations can be received by the radio.
The radio cannot re-send a distress relay automatically. If required you can relay a distress relay message manually.
If a distress relay is sent specifically to the radio then it can be acknowledged, otherwise acknowledgement is not required.