Coastal more demanding than blue water
We just returned from 4 months of sailing our Hunter Legend 43 "Rivendel II" in the Vanuatu archipelago and have talked about the issues discussed in this thread with many a bluewater cruiser over the 10 years or so that we have been cruising the North and South Pacific. I agree with what David and others have already said about the relative importance of the various seaworthiness factors involved, namely: (1) the level of expertise and trip preparation of the crew; (2) their mental and physical condition; (3) boat preparation and maintenance; and (4) vessel design and construction.However. I would like to add that coastal cruising is on average far more demanding and much less safe than bluewater cruising. Not only does one often find the roughest weather and seastate conditions near the coasts, there are the obvious issues of vessel traffic, drunken drivers, fishing nets, pirates, threatening officials, currents, tides, searoom, lee shores, reefs, flotsam, fishing nets, and so on and so forth, that tend to bring far more cruisers into harms way there than out on the ocean. Consequently, most bluewater cruisers we have met feel safer when they are a few days away from land than when the shore is in sight or just over the horizon. Just as the common impulse of novice scuba divers is to swim quickly to the surface in case of trouble, thereby courting serious complications or even death, many beginning cruisers feel safe in the neighborhood of land, whereas in reality an emergency landfall may be the most dangerous part of the entire voyage (see for instance the article by an experienced delivery captain in a recent issue of Sail). If you are counting instead on getting plucked of a vessel in heavy seas and surf near the coast by a helicopter, think again. Some of the most tragic losses at sea (among rescuers as well as rescued) have occurred in precisely that type of scenario over the past one or two decades.The good news is: if you and your vessel are truly and justifiably comfortable while cruising in busy & rough coastal waters you should at most be a few months of preparation away from bluewater passages between the Tropics of Capricorn and Cancer. In fact, chances are that the coastal trip necessary to reach or leave these latitudes will be the most challenging part of the entire voyage!Have fun,Flying Dutchman