> 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/omnitrack/bench-testing-and-simulation/gnss-compass-heading-simulation.md).

# GNSS Compass Heading Simulation

<figure><img src="/files/xAqFnVrDUDudzlQ97SFK" alt=""><figcaption></figcaption></figure>

The GNSS heading simulation provides a stable and repeatable way to give the system a GNSS compass heading fix at a given orientation.

{% hint style="info" %}
The GNSS compass heading is overridden by the IMU simulation yaw. You need to turn off IMU simulation to see the effect of GNSS compass heading.
{% endhint %}

{% hint style="info" %}
The heading entered in the simulation is before any mounting offset is applied.
{% endhint %}