Mmmmm ...
Comedyjock ... you make me very nervous for you ....
I assume from your question you have very little experience with shipboard/maritime operations ... if wrong I apologise ..
I would REALLY suggest you should before embarking on this flight seek out an Ex Naval (Heli) or 'Offshore' aviator and pick his brains (whatever might be left ??
) and get some in depth advice as to how to go about your proposed task.
ALL deck landings should be considered as 'confined areas' and treated with utmost respect ... the opportunities for massive 'F**k Ups' are endless ..
We really need to know what size ship and what a/c you propose to use ... in order to offer better advice (as per sycamore's advice) ...
Be vewy vewy careful ... relative wind might be the least of the issues you encounter !!!