With the emergence of the eastern trade about 1600 the merchant ship had grown impressively. The Venetian buss was rapidly supplanted by another Venetian ship, the cog. A buss of 240 tons with lateen sails was required by maritime statutes of Venice to be manned by a crew of 50 sailors. The crew of a square-sailed cog of the same size was only 20 sailors. Thus began an effort that has characterized merchant shipping for centuries—to reduce crews to the minimum. This was particularly true of oceanic navigation, because larger crews were expensive to pay and to provision—and the large amounts of provisions necessary were sometimes critical on long voyages.

In the north, vessels were commonly three-masted by the 16th century. These were the ships that Cabot used to reach Newfoundland and Drake, Frobisher, and Raleigh sailed over the world’s oceans. Raleigh wrote that the Dutch ships of the period were so easy to sail that a crew one-third the size used in English craft could operate them. Efforts were made to accomplish technical improvements on English copies of Venetian and Genoese traders. These ultimately resulted in the East Indiaman of the 17th century. This large and costly ship was intended to be England’s entry in a fierce competition with the Dutch for the trade of India and the Spice Islands.

When Europeans began to undertake trading voyages to the East, they encountered an ancient and economically well-developed world. In establishing a sea link with the East, European merchants could hope to get under way quickly using the producers already resident there and the goods in established production. What resulted were European “factories,” settlements for trade established on coasts at places such as Bombay (Mumbai), Madras (Chennai), and Calcutta (Kolkata). Some European merchants settled there, but there was no large-scale migration; production of the goods followed established procedures and remained in Asian hands. In contrast, in the New World of America and Australia there was so little existing production of trading goods that the establishment of ties required not only the pioneering of the trading route but also the founding of a colony to create new production. Shipping was critical in each of these relationships but became larger and more continuous in the case of the colonies.

Competition was fierce among the Europeans for the riches of the overseas trade. As the voyages were frequently undertaken by trading consortia from within the chartered company, a great deal is known about the profits of individual round-trips. Standard profits were 100 percent or more. In the accumulation of capital, by countries and by individuals, this mercantile activity was of the utmost importance. Holland’s “Golden Century” was the 17th, and England’s overtaking of France as Europe’s seat of industry also occurred then. The English realized quickly that their merchant ships had to carry enough cannon and other firepower to defend their factories at Bombay and elsewhere and to ward off pirates and privateers on the long voyage to and from the East. In India the English contested trading concessions particularly with France and Portugal; in the East Indian archipelago the contest was with the Dutch and the Portuguese; and in China it was with virtually all maritime powers in northern and western Europe. The result was that the East India merchantmen were very large ships, full-rigged and multimasted, and capable of sailing great distances without making a port.

To secure the strength and competence of these great merchant ships, advances in shipbuilding were necessary. The money was there: profits of 218 percent were recorded over five years, and even 50 percent profit could be earned in just 20 months. Among those undertaking more scientific construction was the British shipbuilder Phineas Pett (1570–1647). Much fine shipbuilding emerged, including ships of the English East India Company, but the company began to freeze its designs too early, and its operating practices were a combination of haughty arrogance and lordly corruption. Captains were appointed who then let out the functioning command to the highest bidder. Education was thin, treatment of sailors despicable, and reverence for established practice defeated the lessons of experience. The merchantmen had to carry large crews to have available the numbers to make them secure against attack. But lost in this effort for security was the operating efficiency that a sound mercantile marine should seek.

It was left more to other maritime markets to develop improvements in merchantmen after the early 17th century. The Dutch competitors of England were able to build and operate merchant ships more cheaply. In the 16th century the sailing ship in general service was the Dutch fluyt, which made Holland the great maritime power of the 17th century. A long, relatively narrow ship designed to carry as much cargo as possible, the fluyt featured three masts and a large hold beneath a single deck. The main and fore masts carried two or more square sails and the third mast a lateen sail. Only at the conclusion of the century, when the Dutch had been decisively defeated in the Anglo-Dutch trading wars, did England finally succeed to the role of leading merchant marine power in the world.

That role was gained in part because Oliver Cromwell restricted English trade to transport in English craft. In 1651 laws were initiated by Cromwell to deal with the low level of maritime development in England. The so-called Navigation Act sought to overcome conditions that had originated in the late Middle Ages when the Hanseatic League, dominating trade in the Baltic and northern Europe, carried most of Britain’s foreign seaborne trade. When the Hansa declined in power in the 16th century the Dutch, just then beginning to gain independence from Spain politically and from Portugal in trade, gained a major part of the English carrying trade. The Navigation Act initiated a rapid change in that pattern. After the restoration of the Stuart monarchy, English shipping nearly doubled in tonnage between 1666 and 1688. By the beginning of the 18th century Britain had become the greatest maritime power and possessed the largest merchant marine until it lost that distinction to the Americans in the mid-19th century.

A further factor in the growth of national merchant marines was the increasing enforcement of the law of cabotage in the operations of the mercantile powers of northern and western Europe with respect to their rapidly expanding colonial empires. Cabotage was a legal principle first enunciated in the 16th century by the French. Navigation between ports on their coasts was restricted to French ships; this principle was later extended to apply to navigation between a metropolitan country and its overseas colonies. This constituted a restriction of many of the world’s trade routes to a single colonial power. It became clear that a power seeking an advantage in shipping would be amenable to supporting the cost and fighting that gaining such colonies might require.

Geographic knowledge gained economic and political value in these conditions. It was in the 17th century that the Dutch, the French, and the English began trying to fill out the map of the known oceans. Islands and coastlines were added to sailing charts almost on an annual basis. By the mid-18th century all the world’s shorelines not bound by sea ice, with fairly minor exceptions, were charted. Only Antarctica remained hidden until the mid-19th century.