> For the complete documentation index, see [llms.txt](https://docs.aviowiki.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.aviowiki.com/conventions/data-format.md).

# Data format

All data exchanged with the aviowiki API, both as part of a request’s body or of a reply’s body, are formatted using [JSON](https://www.json.org/json-en.html).

You can find full details on individual objects in the Data Models section.

### Units of measure

Aviowiki mostly uses the [International System of Units](https://en.wikipedia.org/wiki/International_System_of_Units) for data served via the API.

The main deviation from this is the use of Celsius Degrees in place of Kelvin, for temperatures. This minor variation reflects the more operational use of our data, as compared to the scientific focus of the ISU.

As a general overview, these are the units of measurement used for different use cases:

| Measure          | Unit            |
| ---------------- | --------------- |
| Length           | Metres          |
| Mass             | Kilos           |
| Temperature      | Celsius degrees |
| Coordinates      | Decimal degrees |
| Horizontal Speed | Metres/Second   |
| Vertical Speed   | Metres/Second   |

For full details about the format of each field, refer to the definition in the relevant data model.


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# 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.aviowiki.com/conventions/data-format.md?ask=<question>&goal=<endgoal>
```

`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.