Furuno RC-1500-1T - Manual (Page 274)

1-6
Shortcut key operation
The FELCOM 12 provides the keyboard shortcuts shown below for
commonly used functions.
Table 1-2 Shortcut keys
Function Menus
The function menus, which you access by pressing the function keys
(F1-F10) at the top of the keyboard, control most operations of this
unit.
Figure 1-5 Keyboard, showing function menu keys