17. The MENU Key displays a context-sensitive list of options. This option list allows the
pilot to access additional features or make setting changes which relate to the currently
displayed page.
18. The RNG Key allows the pilot to select the desired map range.
19. The RNG Key allows the pilot to select the desired map range.
20. The COM Flip-flop Key is used to swap the active and standby COM frequencies.
21. The VLOC Flip-flop Key is used to swap the active and standby VLOC frequencies.