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/
dammit the bot was faster than even the explainxkcd page creation bot, not to even speak of https://mastodon.xyz/@xkcd :o