A life on the waves is another one which we associate with hard labor and low returns. The immediate image that comes to mind is a weathered captain of a sea trawler, fighting against the weather to bring in a big haul of fish and collect a payment from a restaurant or a market trader. That can sometimes be the case, but there's more to the industry than that.
A senior professional on any vessel at sea must know the traits of that vessel inside out, how it's likely to respond to adverse weather conditions, and what must be done in an emergency. They're also responsible for the life of everybody on board who's under their command. Certification is essential, for which you'll have to display exemplary navigation skills. Do you think you could bring a boat home with only the stars to guide you? These people can!