> For the complete documentation index, see [llms.txt](https://bellflight.gitbook.io/vertical-robotics-competition/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://bellflight.gitbook.io/vertical-robotics-competition/assembly-and-configuration/fc-setup-and-calibration/qgc-failsafe.md).

# Safety

## Safety Setup

Previously, in the RC Transmitter Setup section, we covered [Setting Up Failsafe](/vertical-robotics-competition/assembly-and-configuration/rc-setup-config/failsafe.md). In QGC we need to make sure we disable some of the failsafe options, as many of them are related to GPS-enabled drones. VRC is all about indoor navigation in a GPS-denied environment therefore it warrants a different safety configuration. The video below walks through the setup process.

{% embed url="<https://www.youtube.com/watch?v=8IWfmRFB6S8&rel=0>" %}

## Disable Safety Switch

Bell VRC is about navigating indoors in a **GPS-denied** environment. In many cases, users of GPS-based drones have a safety switch to pre-arm their drone. Since we do not have the requirement of this hardware we will need to disable the pre-arm check.

To do this we will change one parameter in PX4's configuration known as **CBRK\_IO\_SAFETY**. You can find [all PX4 parameters here](https://docs.px4.io/v1.11/en/advanced_config/parameter_reference.html). It's not important to understand all of these parameters, although it is important to understand the process of changing them, as this will be necessary for **Phase 2** of VRC.

In the video below we give an overview of why this parameter needs to be changed and how to do it. You will learn how to assign a value of **22027** (disabled) to **CBRK\_IO\_SAFETY**.

{% embed url="<https://www.youtube.com/watch?v=L5_IDcIgMcc&rel=0>" %}