> For the complete documentation index, see [llms.txt](https://docs.dataloy.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.dataloy.com/release-8.31/voyage-management-system/step-by-step-guides/voyages/maintain-voyages/overview/update-speed-and-consumption.md).
# Consumption Details
This section suggests the option to customize additional voyage consumption values and explains the related calculations.
Figure 1 shows the additional parameters related to consumption. Initially, these values are taken from the vessel, but they can be modified or retrieved again from the vessel or the Tc In contract for each voyage.
Figure 1. Consumption Details
Values from this section will influence the voyage's consumption calculations but will not affect the vessel’s [speed and consumption](/release-8.31/voyage-management-system/step-by-step-guides/vessels/vessel-speed-and-consumption-data.md#boilers-per-day-and-generators-per-day).
#### Generator and Boiler consumption source
The dropdown field in the top right of the section allows you to track the currently selected consumption source.
* Vessel - all generator and boiler consumption fields\* match the vessel’s generator and boiler consumption settings.
* Tc In - all generator and boiler consumption fields\* match the TC In generator and boiler consumption settings.
* Overridden - indicates that the voyage has uniquely defined generator and boiler consumption values.
Figure 2. Consumption source selector.
It is possible to update all generator and boiler consumption fields at once by selecting either the Vessel or TC In configuration.
List of fields to be updated:
* FO Port Idle
* FO Port Working
* MGO Port Idle
* MGO Port Working
* MGO At Sea
* FO At Sea
* FO Heating
* FO Inerting
* FO Cleaning
* MGO Inerting
{% hint style="info" icon="exclamation" %}
Please review the detailed documentation of the Generator and Boiler consumption fields [here](/release-8.31/voyage-management-system/step-by-step-guides/vessels/vessel-speed-and-consumption-data.md#boilers-per-day-and-generators-per-day-overview) to understand how each field in this section affects the voyage consumption calculation.
{% 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 following URL with the `ask` and `goal` query parameters:
```
GET https://docs.dataloy.com/release-8.31/voyage-management-system/step-by-step-guides/voyages/maintain-voyages/overview/update-speed-and-consumption.md?ask=&goal=
```
`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `build a script that syncs our docs to a CMS` lets GitBook tailor the answer to that use case.
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.
