# Side-Tracking Capability Design Use-Cases

There are two popular design scenarios for side-tracking capability, position hold and dead reckoning.

Position hold is designed to be used to hold the ROV in place next to a feature in the presence of disturbances such as current flow and tether drag. The typical side-tracking usage would be to point the DVL at the target surface, as close to perpendicular as you can make it. The DVL will lock on and begin outputting position and orientation deltas.

When dead-reckoning in side-tracking mode you will normally be using the world-frame mode. See the discussion in the background section above on how dead-reckoning coordinate accuracy might be affected.

{% hint style="info" %}
Note: the dead reckoning in world coordinate space may be distorted by the magnetic field of the target surface, which will typically look like warping the latitude/longitude grid diagonally.
{% endhint %}

{% hint style="info" %}
Note: You may be able to integrate the ROV X-Y-Z velocities when in side-tacking mode to measure distance moved with respect to the target surface. Accuracy would be affected by several factors including magnetic influences and target surface reflectivity characteristics.
{% endhint %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.ceruleansonar.com/c/dvl-75/using-other-than-the-bottom-for-the-dvl-side-tracking-capability/side-tracking-capability-design-use-cases.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.