> For the complete documentation index, see [llms.txt](https://docs.flightsim-studio.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.flightsim-studio.com/e-jet-series/systems-guide/main-panel/primary-flight-display-pfd/com-nav.md).
# COM / NAV
### PFD RADIO CURSOR BOX
* When the PFD is selected using the CCD, a cyan box is placed around the last selected radio frequency. The font size of the frequency digits and the radio source identifier become larger.
* Defaults to the original grey outline and the font decreases in size when mouse cursor is leaving the corresponding box.
* MCDU menu page can change COM1 to COM2 and NAV1 to NAV2 and vice versa.
{% hint style="info" %}
CCD is not simulated. Instead functionality is being provided by mouse over and clicking on the corresponding PFD areas.
{% endhint %}
### EXCHANGE PROMT
* Indicates the green active frequency data is exchanged with the white standby frequency when the CCD ENTER button pushed.
{% hint style="info" %}
CCD is not simulated. Instead you can click on the cyan icon to swap frequencies.
{% endhint %}
### ADJUST PROMT
* Indicates the frequency is changed using the CCD rotary knobs.
{% hint style="info" %}
CCD is not simulated. Instead you can use your mouse wheel to change standby frequency when hovering over it with the mouse.
{% endhint %}
### COM FREQUENCY AND IDENTIFIER DISPLAY
* White COM source identifier annunciator.
* Green COM active frequency.
* White COM standby frequency.
### NAV FREQUENCY AND IDENTIFIER DISPLAY
* White NAV source identifier annunciator
* Green active frequency when manually tuned or magenta when auto tuned.
* White NAV standby frequency.
---
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