Just picked up my truck today 2014 xtr and have no clue what this option is.

When truck is in reverse the camera is displayed in the 4.2 lcd , it has 2 options one is zoom the other is a weird symbol that you can toggle on and off.

I have no clue what it does?

Hope someone can help thanks.

 

I'll answer my own question, the other button is to turn off/on the blocks (yellow, green and red) that come up where an object is.