Furuno 9ZWFM4850 Operator's Manual page 21

DIGITAL SELECTIVE CALLING
After the distress signal is sent, the radio waits for an acknowledgement with the
display showing "AWAIT ACK".
If no acknowledgement is received, the distress signal is repeated at 3.5-to-4.5-
minute intervals, until a DSC acknowledgement is received.
When you receive the DSC acknowledgement, select "ACCEPT".
Step 3
If the radio does not stay on CH16, you need to select "Accept".
If the radio already stays on CH16, skip this step.
Press and hold the PTT key to announce your situation on CH16.
Step 4
Initiate a DSC distress call with the nature of distress specified
The FM-4850 is capable of transmitting a DSC distress call with the following
distress categories: Undesignated, Fire, Flooding, Collision, Grounding, Listing,
FM-4850 Operator's Manual
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