What ancient knowledge guided South China Sea fishermen before GPS?

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Ancient Navigation Manuals Guided South China Sea Fishermen Before GPS

Before the advent of modern GPS technology, generations of Hainan fishermen relied on a handwritten navigation manual known as the Genglubu to traverse the South China Sea. This intricate system of knowledge, passed down through families, allowed sailors to navigate complex waterways, identify landmarks, and undertake long voyages for both sustenance and trade.
The Genglubu as a Comprehensive Navigation Tool

The Genglubu served as a detailed guide, meticulously recording crucial navigational information. This included specific routes, precise compass bearings, and estimated sailing distances, all vital for safely guiding fishing vessels through treacherous reefs, around islands, and across vast expanses of open water. Remarkably, a single line of fourteen Chinese characters within the Genglubu could encapsulate an entire sea route, detailing the departure point, direction of travel, intended destination, total distance, and an approximation of the time required for the journey.
Incorporating Visual and Environmental Data

Beyond textual descriptions of routes, some Genglubu manuscripts also featured "mountain-and-water charts." These unique navigational aids combined hand-drawn sketches of coastlines with essential data such as compass bearings, water depth readings, and prevailing sea conditions. Such visual representations were instrumental in helping sailors accurately identify known landmarks, recognize coastlines, and consequently, determine their precise position at sea.
Evidence of Regional Maritime Trade Participation

Research into specific versions of the Genglubu, such as the Liang Family Genglubu, has revealed navigational routes that extended far beyond the immediate vicinity of Hainan. These records indicate journeys reaching as far as Singapore, Malacca, and Indonesia. This suggests that Hainan fishermen, guided by their traditional knowledge, were not only focused on local fishing grounds but also actively participated in regional maritime trade networks, connecting China with Southeast Asia and other international ports. This maritime tradition, preserved through the Genglubu, underscores a historical period of extensive interregional connectivity facilitated by skilled seafarers.

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What ancient knowledge guided South China Sea fishermen before GPS?

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