> For the complete documentation index, see [llms.txt](https://docs.ceruleansonar.com/c/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ceruleansonar.com/c/sonarview/session-configurations/omniscan-+-altitude-source.md).
# 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:
Then add both to a session:
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!
{% 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
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.
## 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, and the optional `goal` query parameter:
```
GET https://docs.ceruleansonar.com/c/sonarview/session-configurations/omniscan-+-altitude-source.md?ask=&goal=
```
`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.
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.