I don't need a gadget to confuse my GPS..
.. I have a Mercedes.
Bought brand new, the map that came with it (which you can only get upgraded if you pay even more money) was of the same age as the rest of the in-car tech: at least 2 years old (I'm being polite here, I was actually surprised the documentation didn't come on parchment).
In some places it thinks I'n in a meadow, because roads have appeared since. Roundabouts make random occurrences, and its traffic jam detection system is so good that it will give an immediate heads up - if you're in it.
I also have a phone with the TomTom app, which is marginally better at all of the above. So that's what I ended up using - and I am grateful it's a company car. I now would not buy a Merc at 50% discount unless I had someone I disliked to sell it on to.