Furuno FM-8900S Operator's Manual page 49

The timer starts counting up the time since the call was sent. After the call is sent,
the equipment waits for acknowledgment of the call, showing the WAIT FOR ACK
screen as below.
When the ACK is received, the audio alarm sounds and the pop-up message
"ROUTINE (or SAFETY, URGENCY) INDIVIDUAL ACK received! [CANCEL]:
Stop alarm" appears on the screen as below. The timer starts counting up the time
since the ACK was received.
There are three types of ACK messages; [ABLE ACK], [UNABLE ACK] or [ABLE
CHANGE CHANNEL ACK].
11. Do one of the following depending on the message type shown at step 10.
Able acknowledge call received
1) Press the CANCEL key to silence the audio alarm and erase the pop-up mes-
sage.
2) Communicate by radiotelephone.
3) After you have completed communications, rotate the CHANNEL/ENTER
knob to select [QUIT] in the user options area then push the knob.
Able to change channel acknowledge call received
This call means that the station you sent the individual call to accepts your call with
the channel specified.
1) Press the CANCEL key to silence the audio alarm and erase the pop-up mes-
sage. The following message appears on the screen.
2) Press the CANCEL key to erase the message. The working channel is
changed to one that the station specified. You can now communicate by ra-
diotelephone.
3) After you have completed communications, rotate the CHANNEL/ENTER
knob to select [QUIT] in the user options area then push the knob.
4. DSC GENERAL MESSAGE CALLING, RECEIVING
REGIST
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