# Coordinate Frame

For adding mounting offsets in SonarView, you'll need to know the coordinate frame of the Surveyor:

<figure><img src="https://2416497028-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FOPPBWdanG78xVyb6w4vq%2Fuploads%2Fd7cXHGMfJ1oaoX9st8Kf%2Fimage.png?alt=media&#x26;token=8cc8b327-87fb-486c-a47c-107e9bf4af96" alt=""><figcaption></figcaption></figure>

As shown in the image, a positive X-axis offset places the Surveyor forward of the position source, a positive Y-axis offset places it to starboard, and a positive Z-axis offset places it below the position source.

Roll is a rotation about the X-axis. Using the right-hand rule, a positive roll is defined by pointing your right thumb in the positive X direction (forward); the direction your fingers curl indicates the positive direction of rotation (pitch & yaw offsets are not supported by SonarView).

The image below shows where to measure from for the mounting offsets:

<figure><img src="https://2416497028-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FOPPBWdanG78xVyb6w4vq%2Fuploads%2FQjNbj3tCBlIhBfNuPJbv%2Fimage.png?alt=media&#x26;token=c380a4a5-ee49-44a7-93d4-4c6c9d72bb59" alt=""><figcaption></figcaption></figure>