I was once following the GPS to a certain location. As I approached, I thought to myself "Oh, I think it may be that over there" (the building just across the street from where I was). But the GPS said to keep going, so I decided to play along and see. So I went a mile up the road, turned into a small housing division, onto an obscure road that was actually just a loop, then back the way I came, back down the road, and right back to the building I had passed twenty minutes before. Because U-turns aren't a thing as far as the GPS is concerned, so it'll take you on an overly obscure path to get you on the "right" side of the road for where you need to be.
Another fun experiment to try is if you're following a pre-planned route to pull off somewhere for gas or maybe cause you wanted to take a break in your trip, then seeing what the GPS will do to get you "back on course". Remember, U-turn is never a thing, so leading you off a mile in the wrong direction is perfectly acceptable if it allows enough turns to get you back to where you were ten feet prior. Never mind the fact that you might just be in a parking lot and could simply turn back on track at any time. Nope, ten minute detour is the way to go.