As a deckhand
aboard a megayacht, you should earn anywhere from $3000 US per month to $4000 US per month with all food
and travel paid. An STCW-95 certification
is all but mandatory for this position aboard a US flagged vessel, and I think is 100% manditory on vessels flying the Union Jack and other foreign flagged vessels.
Hope this helps.
Another piece of advice, since I had a disasterous experience in this industry:
CHECK OUT THE CAPTIAN!!
Don't blindly assume they are nice, even if you speak to them several times. Get references
, get names of previous deckhands, and CALL THEM. Being trapped aboard with a bad captain
(or worse... wife running the show through the captain) is one of the worst experiences.
Now... BEST OF LUCK! I know lots of people that have done well in this industry - me and my wife weren't one.