> For the complete documentation index, see [llms.txt](https://docs.ceruleansonar.com/c/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ceruleansonar.com/c/ceruleantracker/overview/operating-ceruleantracker/input-device-configuration-panels/rovl-command-window.md).

# ROVL Command Window

The ROVL command window (see Figure below) is most often used to send the fast distance sync (the “D” command) to the ROVL (there is also a shortcut for doing this on the main window dashboard tab). It also has shortcut buttons for other ROVL commands. The basics are:

* Use the Fast Sync for Distance box to put in the known distance at the start of a mission. Type the known distance in meters into the box and hit “Enter.”
* The Magnetic Declination and Speed of Sound boxes work like the Fast Sync for Distance Box. One difference is, Magnetic Declination and Speed of Sound are both stored in flash memory and will persist until you change them again.
* Use the Query Configuration button to ask the ROVL Receiver what values are currently stored in flash memory for Magnetic Declination and Speed of Sound.
* Freeform ROVL commands can be typed into the command textbox. The command is sent when you press “Enter.”
* The larger panel at the bottom of the window shows recent ROVL replies. The scrollbar can be used to look back in the history.
* The Comm Status is intended for debugging, and shows what command was sent (in the Figure, a “?” command was sent) and what hardware was used (“Serial” in the Figure) and the result of the attempt to send (“OK” in the Figure). **Note: this is not the response to the latest command from the ROVL**. Any response from the ROVL is shown in the “replies” window.

![The ROVL Command Window](/files/klB1zMEY7L5NEQHTOVB4)


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