> For the complete documentation index, see [llms.txt](https://docs.innova-drilling.com/introduction/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.innova-drilling.com/introduction/innova-engineering-manual/innova-vantage-manual/13.0-error-models.md).

# 13.0 - Error Models

The Error Models page allow the user to add, remove or edit the survey tool IPMs (Instrument Performance Models) stored in the organisation’s database. Surveys and well plans require a survey tool to be assigned to them, so they can define the ellipse of uncertainty for the wellbore.

![Figure 105: Error Models page](https://100379801-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-McEwHTOM_v4MexTVGSe%2Fuploads%2FbdAvzfMC1BYt12qlqBBN%2F0?alt=media)

The user can add new survey tools using the edit menu, which is opened by clicking on the icon in the bottom right of the page and has the following functions:

**Add:** Adds a new survey tool to the database.

**Refresh:** Refreshes the page.

**Export to XLSX:** Exports the survey tool list and their details in Excel format.

Each tool in the list shows its name, who it was last modified by and when. Clicking on a survey tool allows the user to edit its name. Clicking on the red trash bin icon to the right of each survey tool will delete it. Clicking on the arrow on the far right of each survey tool will open the Edit Tool Terms window for that tool.

### 11.1 - Edit Tool Terms

The tool terms for a survey tool define how the ellipse of uncertainty is calculated when the tool is assigned to a survey.

![Figure 106: Edit Tool Terms page](https://100379801-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-McEwHTOM_v4MexTVGSe%2Fuploads%2FP5OmpygxWZeFoN5tnDsf%2F1?alt=media)

The user can add new tool terms using the edit menu, which is opened by clicking on the icon in the bottom right of the page and has the following functions:

**Add:** Adds a new tool term to the currently opened tool.

**Refresh:** Refreshes the page.

Clicking on a term will open the Edit Term window, which allows the user to change the parameters of that term. A term can be deleted by clicking on the red trash bin icon to the right of each term.


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