Furuno FS-1570 - Manual (Page 180)

APPENDIX
AP-2
Radiotelephone
[#/SETUP] key NB (ON, OFF )
SQ FREQ (500-2000 Hz, 800 Hz )
FAX RX ENABLE (ON, OFF )
USER CH (Set up user channels.)
SYSTEM (Display system settings.)
Default settings
in boldface italic.