If you are trying to find boat crew jobs, you may find online crewing agencies by far the easiest and cheapest way to do this.

Searching websites like this is one type of online crew finder service, however, this site does not actively match you with potential jobs or employers.  This is not a yacht crew agency but more like a classifieds advertising service.

Other sites (which usually charge fee) will physically try to match with vessels and employers who  they have on their books.  These employers will either pay the website or agency a finder fee based on perhaps a percentage of your salary or other sites rely on the crew paying a small charge and will not charge the employers.

Maritime jobs are available all over the world on may types of boat and if you are prepared to travel you should spend time researching what is available.

When using a website to find contacts, always be aware of the many scams which exist.  Many "agencies" claiming to be based in Nigeria or which require some kind of "deposit" up-front should always be treated with the maximum caution. More information on "advance fee fraud" or the "419 scam" can be found here.

Have fund and good luck.