# Dead Reckoning

<figure><img src="/files/ysbIem2DUTdkpfIFQxcv" alt=""><figcaption></figcaption></figure>

{% hint style="info" %}
**Note:**

* Available with select ReXgen Air devices only.
  {% endhint %}

Influx devices combine the Global Navigation Satellite System (GNSS) and dead reckoning for optimal navigation and location accuracy. While GNSS provides precise positioning under ideal conditions, its signal can be weakened or lost in certain environments, such as tunnels, urban canyons, or dense forests, and this is where dead reckoning steps in.

Using an accurately aligned IMU configuration, these devices help detect and plot navigation routes and patterns in areas with minimum GNSS coverage, such as tunnels, underground parking, subways, or other such areas.

Dead reckoning continuously estimates your position based on your device's movement data, such as speed and direction. When GNSS signals are unavailable, dead reckoning takes over, ensuring uninterrupted navigation until the GNSS connection is restored.

[IMU Orientation in ReXgen Air devices](/support_guides/rexdesk-configuration-software-s/rexdesk-rexgen-series-configuration-software/rexdesk-manual/appendix-3-gnss-orientation-guide/dead-reckoning/imu-orientation-in-rexgen-air-devices.md)


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