# Omniscan + Altitude Source

The Omniscan can support multiple devices as altitude sources. The sonar can adjust its imagery so that the water column — the empty space between the sonar and the seabed before the seafloor return arrives — is removed from the display.

You can use either the S500 Sounder, Surveyor 240-16, or the Blue Robotics Ping as an altitude source. Start by adding both the Omniscan and Sounder as devices:

<figure><img src="/files/A01dF1zx1lwV9goinKoD" alt=""><figcaption></figcaption></figure>

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

Then add both to a session:<br>

<figure><img src="/files/LfGrXsl3kUI6QId0vNik" alt=""><figcaption></figcaption></figure>

<figure><img src="/files/YLf2XEpyYzC5wbsyGAze" alt=""><figcaption></figcaption></figure>

You can then exit Session Configurations, start Discovery, and connect to the session. Once connected, start pinging. In the right display control's panel, you will see a Depth Compensation header. Under source, choose the S500 and you're good to go!<br>

<figure><img src="/files/7qm2P9sEHU3j5UWhFmM1" alt=""><figcaption></figcaption></figure>

{% hint style="info" %}
This example just used the S500, but the same steps will work for the Surveyor and the BR Ping
{% 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/sonarview/session-configurations/omniscan-+-altitude-source.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.