Furuno FS-1570 - Manual (Page 121)

7 DSC/WATCH RECEIVER SETUP
7-3
7.3 Auto Ack Menu
The Auto Ack menu enables/disables automatic acknowledgement of individual, position
and polling calls. Press the [#SETUP] key, choose AUTO ACK and then push the [ENTER]
knob to display the Auto Ack setup menu.
Comply type, automatic
acknowledge
ABLE UNABLE
AUTO ACK Can send acknowledge
automatically Can send UNABLE
automatically
MANUAL ACK Can send acknowledge
manually Can send UNABLE manually