To further Shaggy's thoughts, and more for amusement than useful, I have noticed as an airline pax, that on final, with lots of flap out, the wingtip vortex has moved from the wingtip, to the outboard end of the extended flaps. A retired aerodynamisist friend confirmed that the wingtip vortex is not always produced at the wingtip.
In any case, understand where to expect them, and actively avoid!