Are you referring to the magnetic pole switch? That happens every 200-1M years, according to patterns on the seafloor. It’s been estimated that the last reversal was 780,000 years ago, so it theoretically could be any day now.
With that being said, I doubt that humanity will agree to turn all maps 180° to correspond.
Since it's an archipelago underneath then most, if not all, of those islands would have a southern coast. The only way to not have a southern coast is to have the landmass directly on top of the pole, which could only happen for one island (if no ice is present)