Rear Off Selection - what does it do?

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Joined
Dec 25, 2005
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Just past the middle of nowhere in South Texas
On the Display function of the Navigation System is a Rear Off selection that beeps when I touch it, but doesn't appear to functionally do anything. Anyone know if it is supposed to do something other than just beep when selected? Wondering if I have something not working properly with my nav system.

Nothing in the Nav system owner guide that I could find referring to its function or lack of function, either.

Any thoughts?
 
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What year? Backup camera?
 
I assume that button shuts off the rear video screen, but haven't dared to touch it for fear my kids might have to actually look out the windows.
 
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