I have found the documentation on how to set offset of the OTOS to be confusing on a couple of levels. For reference, here is a screenshot of the example I am referring to.
First, it is standard robotics convention for the X direction (local coordinates) to be straight ahead forward with Y to the left.
Secondly, the text of the example doesn’t agree with the picture. The text describes a sensor mounted 5" to the left but the picture shows a sensor mounted to the right.
Since these instructions are intended for someone new to robotics, I think it would be helpful to at least adhere to standard robotics convention for local coordinate frame. And then to make sure the picture agrees with the word description. I can’t really imagine a good reason to rotate the sensor 90 degrees. It is a square board, after all.