> For the complete documentation index, see [llms.txt](https://docs.optitrack.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.optitrack.com/v2.3/motive/calibration/calibration-squares.md).

# Calibration Squares

Options for setting the ground plane and global coordinates in Motive.

During [Calibration](/v2.3/motive/calibration.md) process, a calibration square is used to define global coordinate axes as well as the ground plane for the capture volume. Each calibration square has different vertical offset value. When defining the ground plane, Motive will recognize the square and ask user whether to change the value to the matching offset.

## Custom Calibration Square

| Square Type                                                                                                                                                                                                         | Descriptions                                                                                                                                                                                                                                                                                              |
| ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| ![](https://2142239968-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTSFWA3dBvgCMGQlNWsHE%2Fuploads%2FWfFBU0aH6plmnqX09m62%2Fimage.png?alt=media\&token=1980e187-a03b-4506-b160-21e520bd5b16) | <p></p><p>CS-100: Used to define a ground plane in a small, precise motion capture volumes.</p><ul><li>Long arm: Positive z</li><li>Short arm: Positive x</li><li>Vertical offset: 11.5 mm</li><li>Marker size: 9.5 mm (diameter)</li></ul>                                                               |
| ![](https://2142239968-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTSFWA3dBvgCMGQlNWsHE%2Fuploads%2FRqJXV7aLbfen1adMdgxP%2Fimage.png?alt=media\&token=77a13afe-91cf-4f2a-bd77-c2e18b2f3a37) | <p></p><p>CS-200:</p><ul><li>Long arm: Positive z</li><li>Short arm: Positive x</li><li>Vertical offset: 19 mm</li><li>Marker size: 14 mm (diameter)</li></ul>                                                                                                                                            |
| ![](https://2142239968-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTSFWA3dBvgCMGQlNWsHE%2Fuploads%2FJNhu1dAev7dznGlURfA7%2Fimage.png?alt=media\&token=bebea832-1127-47f1-a660-f50e4f0f3233) | <p></p><p>CS-400: Used for general for common mocap applications. Contains knobs for adjusting the balance as well as slots for aligning with a force plate.</p><ul><li>Long arm: Positive z</li><li>Short arm: Positive x</li><li>Vertical offset: 45 mm</li><li>Marker size: 19 mm (diameter)</li></ul> |
| ![](https://2142239968-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTSFWA3dBvgCMGQlNWsHE%2Fuploads%2FyU6O9aM5qRX3TZOikIPC%2Fimage.png?alt=media\&token=80151ea2-35d4-4ef7-b0d5-99748a894129) | <p></p><p>Legacy L-frame square: Legacy calibration square designed before changing to the Right-hand coordinate system.</p><ul><li>Long arm: Positive z</li><li>Short arm: Negative x</li></ul>                                                                                                          |

## Coordinate System (Motive 1.7+)

For Motive 1.7 or higher, Right-Handed Coordinate System is used as the standard, across internal and exported formats and data streams. As a result, Motive 1.7 now interprets the L-Frame differently than previous releases:

![Motive 1.7+ L-Frame long (marked Z) "leg" interpreted as +Z, L-Frame short (unlabeled) leg interpreted as -X](https://2142239968-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTSFWA3dBvgCMGQlNWsHE%2Fuploads%2F0f40D4AsxqlhwVdNbn1N%2Fimage.png?alt=media\&token=5887e664-dc56-4ea2-a9e1-175df82c2c42)


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