Vince Cate has written an excellent wiki page on Migration:

Imagine each seastead uses a kite and sea anchor to move in a big circle around the Sargasso Sea once each year. The currents are almost fast enough to do this, so even a slow seastead can probably make it. I am thinking Anguilla, Bermuda, Azores, back to Anguilla. We could time it so that we were in the North-Eastern half of this loop to avoid the hurricane season in the South-West and then in the South-Western half of the loop to avoid the cold stormy season in the North-Atlantic. With computers controlling the kites and sea anchors I think we can move at the right speed to make this happen. I think if we checked historical information that doing this you would never have had to face even a 30 foot wave in the last 100+ years. Designing/building for 30 foot waves is much easier than designing/building for 100 foot waves, so this type of migration could make the seasteads much more affordable.