Raymarine Ray230 Owner's Handbook Manual page 67

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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
or nickname. The message and alert are repeated until the CLR key is
pressed.
Flashing
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, even if the volume knob has
been rotated all the way OFF.
You can mute the alert tone by pressing the CLR key for one second.
Pressing CLR only turns off the alert sound; it does not interrupt the
Distress call.
Specified Distress Call
You can assign one of eleven distress types to the call to provide the
potential rescuing station additional information if time and circumstances
permit. The Nature of the distress call can be selected using the DISTRESS
key as outlined below or in the system MENU as outlined in Section
3.5.30.3.1. Below are the messages and their meanings:
press and hold
CLR for 3 secs
CLR
Operations