Title text:
Turning in other directions can be accomplished by using a magnetized centerboard and ocean currents, since a current flowing through a magnetic field induces a Laplace force.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3090/
even if it's true, the effect would likely be unmeasurably tiny. way bellow negligible.
but I'm curious if it is also sort of true.