Wait, what? Every navigation system I ever used showed the speed limit and was capable of giving a warning if you go to fast. And it is pretty accurate, usually

Wait, what? Every navigation system I ever used showed the speed limit and was capable of giving a warning if you go to fast. And it is pretty accurate, usually maybe plus or minus a second of passing the sign. Road works or just recently altered speed limits will of course yield no or false displays but fourtunatly road works are obvious and they don't change speed limits every other day.