Call me old fashioned (though I prefer "old school") but I disdain GPS on my bike. I like to know where I'm going rather than have some electronic voice tell me where to go. I've had some great laughs disagreeing with companions whose GPS was telling them to go against street signs, down a dirt road to find a gas station, or even to ride south when we could see our destination to the east. When traveling, I enjoy reading the map, either paper or on line, ahead of time. Yes, you can still get paper maps. AAA gives them out for free.
So, today I see this story from Milwaukee:
GPS mix up leads semi-truck to become stuck on bike path. See the link for a video.

Following his GPS, a truck driver drove his rig over a walkway and it got stuck on a footbridge...
in broad daylight! Here's another example of a professional trucker getting stuck for following GPS:
So, my somewhat tongue-in-cheek question is, "Just how much do you rely on your GPS?