Helicopters based on boats
Just out of curiosity I asked myself about regulations and real world practices for helicopters based on boats.
Say a rich dude cruises around the world on his yacht with helipad and helicopter. In many countries, off-airport landings are not permitted (most of Europe?) or some countries don't have any civil/private helicopters flying at all (ie. Thailand, just to stay with places where a yacht would go usually).
Can they still fly locally (ie. from the boat to airport, or boat to boat etc), are there usually special regulations, or is this a gray area and as long as it's a country without dictator and/or death penalty people just take their chances?
A whole different story is probably the corrosion issue with a helicopter so close to the salty soup all year long.
PS: Just saw some great pictures of a guy who flew out of a luxury yacht for a year when he was building time.