Raymarine RAY230E Owner's Handbook Manual page 65

Operations
The unit retransmits the DISTRESS call at random intervals of 3.5 to 4.5
minutes, until a response is received or the call is manually cancelled.
To cancel the DISTRESS call, press the CLR key and hold for 3 seconds.
The call is cancelled and the unit returns to the state before the call.
When a response is received, the DSC indicator flashes and the DSC
Distress alert is sounded. The LCD scrolls a message that the DISTRESS
has been acknowledged, along with the sending station's MMSI number.
The message and alert are repeated until the CLR key is pressed.
When the CLR key is pressed, the unit exits the DSC mode continues
monitoring Channel 16 on high power.
Regardless of the handset state, the DSC Distress alert is sounded at
maximum volume on the external speaker.
DISTRESS OFF
press and hold
CLR 3 seconds
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