# GNSS Compass Heading Simulation

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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 %}