Furuno FS-1570 - Manual (Page 138)

8 NBDP SYSTEM OVERVIEW
8-10
Time & Date
Enter date and time manually. If a navigation device is connected,
the time is automatically set when the power is turned on or
whenever the time system is switched. Manual entry takes priority
over automatic entry. If there is no navigation data, it takes more
than 10 seconds for automatic initial settings to take effect after
the power is turned on.
Display mode Selects display mode to normal and reverse alternately.
Function key [F7]: WRU (Who Are You?)
In the ARQ mode, requests other station's answerback code.
Function key [F8]: HR (Here Is)
In the ARQ mode, sends your ship's answerback code.
Function key [F9]: OVER
In the ARQ mode, switches the direction of traffic; the information receiving station becomes
the information sending station, the information sending station becomes the information
receiving station.
Function key [F10]: BREAK
Disconnects the communications line.