If you are wanting to crew on a cruising yacht or looking for crew to
fill a vacancy you can find hundreds of crew and post for free at
http://www.crewfile.com
With a new automatic notification feature, you do not need to check
the site regularly as updates are sent to you by email - this
increases your chances of being first in the queue.
Posting is free and you have the option to disclose or retain your
email address - this avoids your address being scraped and used for
spam.

CrewFile could help you find what you want.
http://www.crewfile.com