The Chinese, in fact, are equally unskilled in naval architecture, as in the art of navigation. They keep no reckoning at sea, nor possess the least idea of drawing imaginary lines upon the surface of the globe, by the help of which the position of any particular spot may be assigned; in other words, they have no means whatsoever of ascertaining the latitude or the longitude of any place, either by estimation from the distance sailed, or by observation of the heavenly bodies, with instruments for that purpose. Yet they pretend to say, that many of their early navigators made long voyages, in which they were guided by charts of the route, sometimes drawn on paper, and sometimes on the convex surface of large gourds or pumpkins. From this circumstance, some of the Jesuits have inferred, that such charts must have been more correct than those on flat surfaces. If, indeed, the portion of the convex surface, employed for the purpose, was the segment of a sphere, and occupied a space having a comparative relation to that part of the surface of the earth sailed over, the inference might be allowable; but this would be to suppose a degree of knowledge to which, it does not appear, the Chinese had at any time attained, it being among them, in every period of their history, an universally received opinion, that the earth is a square, and that the kingdom of China is placed in the very center of its flat surface.
The present system of Chinese navigation is to keep as near the shore as possible; and never to lose sight of land, unless in voyages that absolutely require it; such as to Japan, Batavia, and Cochin-China. Knowing the bearing, or direction of the port intended to be made, let the wind be fair or foul, they endeavour, as nearly as possible, to keep the head of the ship always pointing towards the port by means of the compass. This instrument, as used in China, has every appearance of originality. The natives know nothing, from history or tradition, of its first introduction or discovery; and the use of the magnet, for indicating the poles of the earth, can be traced, from their records, to a period of time when the greatest part of Europe was in a state of barbarism. It has been conjectured, indeed, that the use of the magnetic needle, in Europe, was first brought from China by the famous traveller Marco Polo the Venetian. Its appearance immediately after his death, or, according to some, while he was yet living, but at all events, in his own country, renders such a conjecture extremely probable. The embassies in which he was employed by Kublai-Khan, and the long voyages he performed by sea, could scarcely have been practicable without the aid of the compass. Be this as it may, the Chinese were, without doubt, well acquainted with this instrument long before the thirteenth century. It is recorded in their best authenticated annals merely as a fact, and not as any extraordinary circumstance, that the Emperor _Chung-ko_ presented an embassador of Cochin-China, who had lost his way in coming by sea, with a _Ting-nan-tchin_ "a needle pointing out the south," the name which it still retains. Even this idea of the seat of magnetic influence, together with the construction of the compass-box, the division of the card into eight principal points, and each of these again subdivided into three, the manner of suspending the needle, and its diminutive size, seldom exceeding in length three quarters of an inch, are all of them strong presumptions of its being an original, and not a borrowed invention.