DSC Procedures Flashcards

What is the minimum content a DSC distress alert must contain?

Answer: MMSI number and nature of distress (position is added automatically if GPS connected)

The minimum DSC distress alert contains the MMSI number (automatically) and the nature of distress selected by the operator. If GPS is connected and has a fix, position and UTC time are added automatically.

After a DSC distress acknowledgement is received, on which channel should the MAYDAY voice message be transmitted?

Answer: Channel 16

Following a DSC distress alert on Channel 70 and its acknowledgement, the MAYDAY voice message must be transmitted on Channel 16, the international distress and calling frequency.

What is the purpose of the DSC 'test' call category?

Answer: To check DSC equipment is working without activating a real distress alert

The DSC test call category allows operators to verify their DSC equipment is functioning and can communicate with a coast station without triggering a real SAR response. A reply is expected confirming receipt.

If GPS fails on a DSC-equipped vessel, what should the operator do before sending any distress alert?

Answer: Manually enter the vessel's last known position and UTC time into the DSC controller

If GPS fails, the operator should manually input the vessel's last known position and UTC time into the DSC controller so that position information is included in any distress alert sent.

How long should a vessel maintain a watch on Channel 16 after sending a DSC distress alert?

Answer: Continuously until the distress situation is resolved

A vessel in distress must maintain a continuous watch on Channel 16 after sending a DSC alert to receive instructions from the coast station coordinating SAR operations.

What is the correct procedure if you hear a MAYDAY on Channel 16 but cannot render assistance?

Answer: Listen and maintain radio silence unless you can assist or relay

If you hear a MAYDAY but cannot assist, you must maintain silence on Channel 16 and listen. Speaking unnecessarily would interfere with distress communications. Only relay the message if it appears no coast station has acknowledged.