Furuno FM-4800 Operator's Manual page 51

Enter the DSC test interface
On the home screen, press the Menu/DSC control to enter the "MAIN
Step 1
MENU" screen.
Step 2 Select "DSC CALL".
Select "DSC TEST" to enter the "DSC TEST" interface on the screen, as
Step 3
shown below.
Initiate a DSC test call to a vessel registered in the individual
directory
Before you initiate a DSC test call from the individual directory, a vessel or person's
name and the MMSI number associated with the vessel you want to transmit the call
to should be added to the individual directory. For information about how to add
entries to individual directory, see section 11.1.1 Adding an Entry.
On the "DSC TEST" interface, select "DIRECTORY".
Step 1
Select an individual contact.
Step 2
Press the Menu/DSC control to send the DSC test call.
Step 3
Your radio waits for an acknowledgement from the radio you called.
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