Furuno FS-1575 FS-2575 FS-5075 User Manual

3.  DSC OVERVIEW

This section provides the information necessary for interpreting the receive and send 
call screens.

Below are sample distress alert and individual RX call screens. The contents of other 
types of RX calls are similar to that of the individual call.

Distress alert sent

2200 Hz, continuous (2 seconds)

Own ship position not updated

2000 Hz (250 ms) and 0 Hz (500 ms)

Distress alert call received

2200 Hz and 1300 Hz (250 ms)

Distress relay call received

2200 Hz and 1300 Hz (250 ms)

Distress relay ack call received

2200 Hz (500 ms) and 1300 Hz (500 ms)

Distress ack call received

2200 Hz (500 ms) and 1300 Hz (500 ms)

Urgency call received

2200 Hz and 0 Hz (250 ms)

Urgency ack call received

2200 Hz and 0 Hz (500 ms)

Working frequency 
to use

Call type

Elapsed time since 
distress alert received

ID No. (MMSI) 
of ship in 
distress

Communication 
mode and 
suggested 
channel

Available user options 

Session in progress

RF gain

Speaker icon

DSC frequency

Position of ship 
in distress

Nature of distress

Distance to ship 
in distress

°

°

Working frequency 
to use

Speaker icon

Elapsed time since 
call received

ID No. (MMSI) 
of ship 
sending this 
message

Communication 
frequency

RF gain

Available user options 

Communication mode

Session in progress 

Call type

ELAPSED TIME:
 

H

M

S

FROM               :

COMM MODE  :

COMM FREQ   :

 2170.0 kHz