# Coordinate Frame

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

<figure><img src="/files/kMocyeBJe8GoCzUafT53" 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="/files/1XZjThTu92f7R4IhhLSu" alt=""><figcaption></figcaption></figure>


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