Furuno FM-8900S Operator's Manual page 39

How to send a distress acknowledge call
When you receive a distress alert from a ship in distress, the audio alarm sounds and
the LED flashes in red. If your ship meets the requirements necessary to transmit the
distress acknowledge call, do the following:
1. Press the CANCEL key to silence the audio alarm and stop the flashing of the
LED.
2. Rotate the CHANNEL/ENTER knob to select [ACK] in the user options area then
push the knob. The following message appears on the screen.
3. If you do not receive the distress acknowledge call from a coast station within five
minutes and your ship meets requirements for transmitting the distress acknowl-
edge call, rotate the CHANNEL/ENTER knob to select [Yes] then push the knob
to send the distress acknowledge call to the ship in distress. The screen changes
as below.
TX
ACK
Begin search and rescue operations for the ship in distress, communicating with the
ship over CH16 (automatically set). Relay distress alert to a coast station by DSC fol-
lowing the instruction in the next section. Finally, follow the instructions of the coast
station.
3. DSC DISTRESS OPERATIONS
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