Originally Posted by gregw
Finding a wind powered boat (would that be a sail boat) that was made without using any fossil fuels that is capable of an ocean crossing will be tough.
This is true.
My father's Erickson is just barely capable of comfortable ocean travel, but even it has a motor for when you are coming into port - this is particularly handy on rough days when you
want to take the sails down and get into port unaided by wind. It is possible to sail into port, but it's not commonly done unless there's a problem with the motor or if the skipper wants to practice doing it. Perhaps you can persuade a cap'n to do that for you at the other end of your sea voyage, but (s)he will be reluctant to do so if you are sailing into certain types of basin dockworks.