Furuno USA Inc 9ZWFS2575 Manual Do Utilizador

 

DSC is an acronym meaning Digital Selective Calling. It is a digital distress and general 
calling system in the MF and HF bands used by ships for transmitting distress alerts and 
general calls and by coast stations for transmitting the associated acknowledgements. 
For DSC distress and safety calling in the MF and HF bands, the frequencies are 2187.5, 
4207.5, 6312.0, 8414.5, 12577.0, and 16804.5 kHz. 
 
The DSC station sends and receives DSC general and distress calls via the radiotelephone. 

Distress Frequency

Routine DSC Call

Option

Routine DSC Calls

TRANSCEIVER 

UNIT

CONTROL UNIT

Distress and Routine DSC Calls

 

DSC calls are roughly divided in two groups: distress, urgency and safety messages, and 
general messages. Below are the types of DSC messages. 

DISTRESS ALERT 

Your ship sends distress message 

DISTRESS RELAY AREA 

Your ship relays distress call to all ships in a specific 
geographical area 

DISTRESS RELAY 
INDIVIDUAL 

Your ship relays distress call to a coast station 

MEDICAL MSG 

Inform areas that your ship is carrying medical supplies* 

NEUTRAL MSG 

Inform areas that your ship is not a participant in armed conflict* 

INDIVIDUAL MSG 

Call to a specific address 

PSTN MSG 

Call over Public Switched Telephone Network (PSTN) 

TEST MSG 

Send test signal to a station to test your station’s functionality 

GROUP MSG 

Call to a specific group 

AREA MSG 

Call to all ships in a specific geographical area 

POSITION MSG 

Your ship requests position of other ships 

POLLING MSG 

Confirm if your ship is within communicating range with other 
ships. (Receive and answer only) 

*SPECIAL MSG: When sending these messages, set the acknowledgement. See section 
6.16.