From the Website HINDU WISDOM

Bhoja says that care should be taken that no iron be used, in joining planks, but they be subjected to the influence of magnetism, but they are to be fitted together with substances other than iron. Bhoja also gives names of the different classes of ships:

1. River-going ships –Samanya;
2. Ocean-going ships – Visesa.

The measurements in cubits of the “Ordinary class” of ships are the following:

Bhima, Bhaya, Garbhara are liable to bring ill-luck because their dimensions are such as not to balance themselves in water.

Among the “Special” are two classes.

1. Dirgha

2. Unnanta

Lota, Gamini, Plavini, Anurddhava, Gharbhini, Manthara bring misfortune, because of their dimensions, and Urddhva much gain.

The “Yaktikalpataru” also suggests the metals to be used in decorations, eg. Gold, silver, copper, and compounds of all three as well as the colors. A vessel with four masts is to be painted white, the one with three masts is to be given a red paint, a two masted vessel is to be colored yellow, and a one masted vessel is to have a blue color. The prows are to be shaped into the form of heads of lions, buffalos, serpents, elephants, tigers, ducks, pea-hens, parrots and human beings, thus arguing an advanced progress in carpentry. Pearl and gold garlands are to decorate the prows.

Three classes of Ships:

According to cabins, ships are to be grouped into three classes:

Sarvamandira ships, having the largest cabin, from one end of the ship to the other. These are to be used for the transportation of the royal treasury, of women and horses. Madhyamandira ships, with cabins in the rainy season. Ships with cabins near the prows, are called Agramandira, and are for sailings in the dry seasons as well as for long voyages, and naval warfare.It was in these ships, that the first naval battle recorded in Indian literature, was fought, when Tugra, the Rishi King, sent his son Bhujyu against his enemies inhabiting some Island, and Bhujya on being wrecked, was rescued by two Asvins, in their hundred oared gallery. Of the same description are the five hundred vessels, mentioned in the Ramayana. Carried 1000 Passengers: In Rajavalliya, the ship in which Prince Vijaya and his followers were sent away by King Sinhala of Bengal, was large enough to accommodate seven hundred passengers. The ship in which Prince Vijaya’s bride was conveyed to Sri Lanka, was big enough to accommodate eight hundred people of the bride’s party. The ship which took Prince Sinhala to Sri Lanka contained five hundred merchants besides the Prince himself. The Janaka Jataka mentions a ship-wreck of seven hundred passengers. The ship by which was effected the rescue of the Brahmin mentioned in Sankha Jataka was 800 cubits in length, 600 cubits in width, 20 fathoms deep, and had three masts. The ship mentioned in the Samuddha Vanija Jataka was big enough to transport a village full of absconding carpenters, numbering a thousand, who had failed to deliver goods paid for in advance.

Early History: An ancient couplet betrays the spirit with which the Indians were imbued and which accounts for their wonderful achievements on land, beyond seas and across mountain barriers. There is indeed evidence to show that the sons of the soil were adept at navigation both riverine and oceanic. Right from the dawn of history, therefore, Indians have been engaged in plying boats and ships, carrying cargoes and passengers, manufacturing vessels of all types and dimensions, studying the stars and winds, erecting light-houses and building ports, wharfs, dockyards and warehouses. From rustic beginnings they developed a precise science of navigation and composed regular manuals as well as elaborate treatises on the subject, some of which survive to this day. It is noteworthy that the very term navigation is derived from nau, which in Sanskrit word for ‘ship’ or ‘boat’. Thus navi gatih ‘going in a boat’ amounts to ‘navigation’.

Literary Evidence: Sanskrit literature is full of references to river transport and sea voyages. Sometimes we have graphic descriptions of fleets, even of ship-wrecks. The Rig-Veda is taken as the earliest extant work of the Aryans, though there is no general agreement as to its exact age. At one place, Rishi Kutsa Angirasa prays to Agni: “Remove our foes as if by ship to the yonder shore. Carry us as if in a ship across the sea for our welfare.”

In Ramayana: In Valmiki’s Ramayana, we come across beautiful descriptions of large boats plying on the Ganga near Sringiberapura. King Guha of that place arranges a magnificent boat for Rama accompanied by Lakshman and Sita, in exile, to enable the party to cross the river.When Bharat comes later to the same place, with the whole royal household, citizens of Ayodhya and a large army, with the intention of bringing Rama back to Ayodhya from exile, the same King Guha, suspecting Bharata’s intentions, take precautionary measures by ordering five hundred ships, each manned by one hundred youthful mariners to keep in readiness, should resistance be necessary.

The descriptions of the ships is noteworthy: “Some (of the ships) reared aloft the swastika sign, had tremendous gongs hung, flew gay flags, displayed full sails and were exceedingly well built” The ships chosen for Bharata and the royal ladies of the royal household had special fittings and furniture as well as yellow rugs.

In Mahabharata: In the Mahabharata too there are many references. The ship contrived by Vidura for the escape of Pandavas had some kind of mechanism fitted in it: “the ship strong enough to withstand hurricanes, fitted with machinery and displaying flags.” Panini, who lived about the 7^th century B.C. in his Ashtadhyayi, the most commented upon work on Sanskrit grammar, has incidentally recorded certain usages which reflect in a way the maritime activity before and during his days in India. According to one sutra various types of small river craft were in use, and their names were utsagna, udupa, udyata, utputa, pitaka etc. A large boat was called Udavahana or udakavahana. Of special interest is the distinction made between the cargoes coming from an island near the coast and those coming from mid-ocean islands: the former were called dvaipya, and the latter dvaipa or dvaipaka. Certain other sutras speak of ferry chages, cargoes, marine trade and the like of those days.

Chandragupta Maurya’s minister, Vishnugupta Chanakya alias Kautilya, the celebrated author of the treatise on statecraft, Kautilya Arthasastra, of about 320 B.C. devotes a full chapter to waterways under a Navadhyaksha ‘Superintendent of ships’. His duties included the examination of accounts relating to navigation, not only on oceans and mouths of rivers, but also on lakes, natural or artificial, and rivers. Fisheries, pearl fisheries, customs on ports, passengers and mercantile shipping, control and safety of ships and similar other affairs all came under his charge. Jaina scriptures, Buddhist Jatakas and Avadanas, as well as classical Sanskrit literature, abound in references to sea-voyages. They acquaint us with many interesting details as to the sizes and shapes of ships, their furniture, and decorations, articles of import and export, names of seaports and islands, in short, everything connected with navigation.

Temples Give Proof: In the temple of Jagannath at Puri, a stately barge is sculptured in relief. The oarsmen paddle with all their strength, the water is thrown into waves, and the whole scene is one of desperate hurry. The boat is of the Madhyamandira type, as defined by Bhoja in the “Yuktikalpataru”. The Ajanta paintings are rightly interpreted by Griffiths as a “vivid testimony to the ancient foreign trade of India.” Of the many paintings one is of “a sea-going vessel with high stem and stern with three oblong sails attached to as many upright masts. Each masts is surrounded by a truck and there is carried a big sail. The jib is well filled with wind. A sort of bowspirit, projecting from a kind of gallows on deck is indicated with the outflying jib, square in form,” like that of Columbus ships. The ship is of the Agramandira type, as described in the “Yuktikalpataru”. Another painting is of a royal pleasure boat which is “like the heraldic lymphad, with painted eyes at stem and stern, a pillard canopy amid ships, and an umbrella forward the steersman being accommodated on a sort of ladder, which remotely suggest the steerman’s chair, in the modern Burmese row boats, while a rower is in the bows.” The barge is of the Madhyamandira type.

Sculpture at Borobudur: The temple of Borobudur in Java contains sculptures recalling the colonization of Java by Indians. One of the ships “tells more plainly than words, the perils, which the Prince of Gujarat and his companions encountered on the long and difficult voyages from the west coast of India.” There are other ships tempest-tossed on the Ocean, fully trying to pluck and dexterity of the oarsmen, sailors, and pilots, who, however, in their movements and looks impress one with the idea, that they were quite equal to the occasion.

What Historian say: Nicolo Conti says:

“The natives of India build some ships larger than ours, capable of containing 2,000 butts, and with five sails and as many masts. The lower part is constructed with triple planks, in order to withstand the force of the tempests, to which they are much exposed. But some ships are so built in compartments, that should one part be shattered, the other portion remaining whole may accomplish the journey.” 

Mr. J. L. Reid, member of the Institute of Naval Architects and Shipbuilders, England and the Superintendent of the Hongli Docks, has stated:

“The early Hindu astrologers are said to have used the magnet as they still use the modern compass, in fixing the north and east, in laying foundations, and other religious ceremonies. The Hindu compass was an iron fish, that floated in a vessel of oil, and pointed, to the north. Fact of this older Hindu compass seems placed beyond doubt by the Sanskrit word “maccha-yantra.” 

India’s extensive Sea-borne Trade: The historian Strabo says that in the time of Alexander, the River Oxus was so easily navigable that Indian wares were conducted down it, to the Caspian and the Euxine sea, hence to the Mediteranean Sea, and finally to Rome. Greeks and Indians began to meet at the newly established sea ports, and finally all these activities culminated in Indian embassies, being sent to Rome, from several Indian States, for Augustus himself says that Indian embassies came “frequently.” Abundant Roman coins from Augustus right down to Nero, have been found in India.

Archaeologist’s Testimony: Archaeology amply supports literary record. Excavations at Mohenjodaro on the Indus have yielded, among other things, a potsherd and couple of steatite, seals each bearing a representation of  a boat or a ship incised on it. By far the most substantial proof is afforded by the discovery of a dockyard at Lothal in Gujarat.

The eminent Indian archaeologist Dr. Bahadur Chand Chhabra concludes:

“It may be a surprise even to an Indian today to be told that in the ancient world India was in the forefront in the field of shipping and ship-building. Her ships, flying Indian flags, sailed up and down the Arabian Sea, the Indian Ocean and far beyond to Southeast Asia. Her master-mariners led the way in navigation. Riverine traffic within the country, shipping along the entire length of India’s coastline, and on high seas were brisk until as recently as the days of the East India Company. Owing however, to historical competition by the British, ancient Indian shipping was wiped out without a trace. No wonder then the common man in India today readily believes that Indians are not only now learning the ABC of navigation. It would have been odd indeed if, bounded on three sides by great oceans, and gifted with a remarkable spirit of enterprise and invention, India had registered no advancement in the sphere of navigation while she had gone far in other arts and sciences.

(source: Hindu America: revealing the story of the romance of the Surya Vanshi Hindus and depicting the imprints of Hindu culture on the two Americas – By Chaman Lal with foreword by Dr. S. Radhakrishnan. 3d ed. (LC History-America-E) 1966).