# Operating in contested or denied environments
In **hostile** or **contested environments**, the performance of unmanned systems may be degraded or lost entirely. This can include:
* **Total loss of communication** with the drone
* **GNSS-denied conditions**, where satellite positioning is unavailable or jammed
This section outlines **critical settings and mitigation steps** to enhance operational resilience and improve the chance of mission success in these conditions.
### Configuring Safety Parameters
Before flight, ensure **safety parameters** are correctly configured for each connected drone:
1. Navigate to the **Safety Parameters** page in the interface.
2. Select the appropriate **vehicle** from the list.
{% hint style="warning" %}
The vehicle must be **powered on and connected** to adjust safety settings.
{% endhint %}
3. Review and adjust safety parameters to align with your **mission profile** and **threat environment**.
{% hint style="info" %}
It is strongly recommended to verify these settings **prior to every mission**, especially in contested areas.
{% endhint %}
***
### GNSS-Denied environments
When GNSS signals are unreliable or unavailable:
* **Set a Fallback Location** before takeoff.
* Access this setting in the **Drone Controls Panel**.
* The fallback point provides a reference for safe recovery or Return-to-Land (RTL) behavior if positioning data is lost.
{% hint style="warning" %}
Setting fallback behaviors is critical when operating in areas prone to jamming, spoofing, or poor satellite coverage.
{% endhint %}
***
The Nexus Stribog UAS automatically detects GNSS-denied environments and can fly in visually aided mode up to an operational altitude of approximately 100m. When flying in heavily contested areas, it is recommended to maintain a flight level around 60-80m.
In **Operator View**, it is possible to use only GNSS-denied navigation without GNSS. This mode is intended for advanced use and can cause potential performance loss during landing and takeoff. Therefore, using this switch is recommended only in edge cases that will help fulfill the mission.
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