How do I turn the whole thing On or Off? I searched through every menu choice on my XL IQ Routes edition TT (XL 335S) I could find, but couldn't find a menu choice to do it. Then I searched through the user manual for my device, then TT support, then TT forum, and I still can't find the info. I spent about 6 hours yesterday trying to figure it out. Thing is, I've done it before, a few weeks ago, But searching through my memory isn't helping either. Could someone just tell me?