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By:

Commodore S.L. Deshmukh

31 October 2024 at 8:30:19 am

The Digital Compass at Sea

Electronic chart systems have transformed maritime navigation, but their promise of safer voyages depends on reliable data and rigorous regulatory compliance. The sea has always punished navigational complacency. For centuries, mariners relied on paper charts, manual plotting and accumulated experience to steer vessels through treacherous waters. These methods remain part of maritime tradition, but modern shipping demands a more integrated approach to navigation. The Electronic Chart Display...

The Digital Compass at Sea

Electronic chart systems have transformed maritime navigation, but their promise of safer voyages depends on reliable data and rigorous regulatory compliance. The sea has always punished navigational complacency. For centuries, mariners relied on paper charts, manual plotting and accumulated experience to steer vessels through treacherous waters. These methods remain part of maritime tradition, but modern shipping demands a more integrated approach to navigation. The Electronic Chart Display and Information System (ECDIS) represents a decisive step in that direction, combining official digital charts with real-time information from a vessel’s navigational sensors. Its growing importance reflects a simple truth: in an industry where a minor navigational error can have catastrophic consequences, better information can make the difference between a safe passage and disaster. ECDIS is not merely a digital version of a paper chart. It is a type-approved navigational information system that displays official Electronic Navigational Charts (ENCs) and integrates data from equipment such as the Global Positioning System (GPS), gyrocompass, radar, Automatic Radar Plotting Aid (ARPA), Automatic Identification System (AIS) and echo sounder. By bringing these inputs together, it gives navigators a consolidated picture of the vessel’s position, its surroundings and potential hazards. The International Maritime Organisation (IMO) recognises compliant ECDIS, when used with appropriate official chart data, as meeting the relevant chart-carriage requirements under Chapter V of the International Convention for the Safety of Life at Sea (SOLAS). The distinction matters: an ordinary electronic display is not necessarily an ECDIS, and the use of unofficial chart data does not confer the same regulatory standing. Beyond Charts The system’s principal advantage lies in its ability to combine information and alert navigators to developing risks. It supports route planning and monitoring, checks proposed routes against configured safety parameters, displays the vessel’s position in real time and generates alarms when specified dangers or deviations are detected. Depending on the equipment and data available, radar, AIS, weather, tidal and other information can also be overlaid on the chart. This integration can reduce the burden of maintaining paper charts and manually plotting a vessel’s position. It can also help crews identify navigational hazards earlier, monitor their progress more efficiently and make better-informed decisions. In commercial shipping, where time, fuel consumption and operational reliability all matter, these benefits extend beyond safety to voyage efficiency. Yet ECDIS should not be mistaken for an autonomous navigator. Its alarms and safety checks depend on correctly configured settings, reliable sensor inputs and accurate chart information. Officers must understand what the system is displaying, recognise its limitations and retain the judgement to challenge misleading or incomplete information. The regulatory framework reflects the importance of getting this right. Under SOLAS Chapter V, ECDIS carriage became mandatory for specified categories of ships through a phased implementation schedule. The requirements cover, among others, new passenger ships of 500 gross tonnage and above and new cargo ships of 3,000 gross tonnage and above, subject to the applicable provisions and ship categories. The charts themselves are equally important. Official ENCs are vector charts produced to International Hydrographic Organization (IHO) standards. ECDIS processes this information into a System Electronic Navigational Chart (SENC), the internal database used by the equipment. Raster Navigational Charts (RNCs), by contrast, are digital images of paper charts. Software maintenance is therefore central to compliance. IHO standards have evolved, and equipment must remain compatible with the applicable requirements. New ECDIS installations have been expected to meet the relevant standards in force at installation, while existing systems require appropriate maintenance and upgrades. IMO guidance, including MSC.1/Circ.1503, has highlighted the importance of keeping ECDIS software properly maintained. Ship operators cannot assume that a system remains compliant simply because it was approved when first installed. Flag administrations and port-state control authorities may identify deficiencies where applicable requirements are not met. Maritime Imperative For India, these requirements carry particular significance. Its commercial shipping fleet operates within an international regulatory environment in which navigational safety, technical compliance and crew competence are inseparable. India has acceded to SOLAS and has used directives issued by the Directorate General of Shipping (DG Shipping) to implement applicable ECDIS carriage requirements. The government has also pursued the incorporation of relevant provisions into the domestic regulatory framework. DG Shipping has invoked Section 406(3) of the Merchant Shipping Act, 1958, in connection with ECDIS carriage requirements and the conditions attached to statutory certification. Implementation schedules for Indian ships undertaking international voyages have been prescribed, with compliance subject to regulatory oversight. Training is the other indispensable element. Navigational officers serving on ECDIS-equipped vessels must receive the applicable training in accordance with the International Convention on Standards of Training, Certification and Watchkeeping for Seafarers (STCW), including the Manila amendments of 2010. Officers must be competent in route planning, alarm interpretation, chart management, system limitations and the response to equipment failure. India has an established marine services sector capable of supporting this transition. Companies offer ECDIS upgrades and maintenance alongside services for AIS, anemometers, autopilots, bridge navigational watch alarm systems, compasses, echo sounders and Global Maritime Distress and Safety System equipment. Marine radar servicing, including X-band and S-band systems, and the maintenance of associated electronic equipment are also available across Indian ports and anchorages. Shipowners must ensure that upgrades are undertaken by competent personnel, that equipment remains properly maintained and that the documentation needed for class surveys and port-state inspections is in order. Periodic checks should be treated as an operational necessity rather than an expense to be deferred. ECDIS is most effective when official charts, updated software, dependable sensors, trained officers and disciplined bridge procedures work together. A failure in any one of these elements can compromise the whole arrangement. As shipping becomes more technologically sophisticated, ECDIS is set to remain a central platform for navigation aboard commercial vessels. Its value lies not simply in replacing paper charts, but in helping crews interpret their surroundings, anticipate hazards and manage voyages with greater precision. For India, effective implementation is therefore both a regulatory obligation and a strategic investment in safer shipping. The challenge is to move beyond carriage requirements and ensure continuing operational competence. (The writer is a retired naval aviation officer and defence and a geopolitical analyst. Views personal.)

Casting of the Pearls: A Diplomatic Puzzle that shaped History’s Course

Feb 6, 2025
4 min read

Updated: Feb 7, 2025

A 1077 diplomatic mission from the Chola Empire to the Song court raises questions about ancient maritime rivalries, trade and the blurred lines between empires.

Chola Empire

In the Songshi, the written history of the Chinese Song Dynasty (960-1279) as published in the year 1346, it states that a diplomatic mission from the Chola Empire arrived at the Song imperial court in Kaifeng on June 27, 1077 C.E. The envoy is named as Qilolo. Three days later, the mission was received by the Emperor Shenzong, where Qilolo was allowed to cast pearls before the throne.


This event was also recorded at the time as quite the curiosity by a minor conservative Chinese official, Peng Cheng, who noted – perhaps with some distaste that such a ‘foreign custom’ be allowed – that the envoy, Qilolo, knelt at the doorway to the throne room, held a golden plate bearing the pearls above his head, and then, using a lotus-shaped ladle, scooped up tens of liangs of pearls (a liang, a Chinese measure, is approx. 2 ounces) and spread them across the floor in the direction of the throne. According to Peng Cheng, this custom – known as sadian – is the Cholas’ most ‘venerable ritual’. Was the allowing a foreign ritual then, an acknowledgement by the Song court of the importance of trade between the Chola Empire and China?


Due to demographic changes within Song Dynasty China, there had been an increased demand for foreign goods. To meet this demand, the Song court had revamped its tribute system, now selling those tribute goods and levying taxes on those sold in Chinese markets – the cash raised amounting to over 9 percent of the Privy Purse. On the other hand, return gifts and honorific titles for tribute goods made commercial dealings with China more worthwhile than usual – enough to make some ‘ship masters’ pretend to be diplomatic envoys! In 1077, the Chola delegation received 81,800 strings of copper cash and 52,000 taels of silver in return for their pearls and other trade goods.


Just as in the 21st century, the South China Sea of the 11th century was a contested space. In what is now India’s Tamil Nadu, the Chola Empire, founded by Vijayalaya in 848, was flourishing. By the 11th century it had built an unprecedented naval capability to dominate all of the Indian Ocean trade routes. But the Cholas had a serious competitor: the Sri Vijayan Empire based in Sumatra, in modern Indonesia. Both the Cholas and the Sri Vijayans wanted to control the lucrative maritime trade with China.


The Sri Vijayans had been trading with China for a very long time. Sensing the increasing importance of Sri Vijaya, the Chinese Tang Dynasty court had sent a diplomatic mission in 683, which was reciprocated by Sri Vijaya in 702. During the early years of the Song Dynasty, the Sri Vijayans sent no less than sixteen diplomatic missions to China between the years 960 and 1017, and it successfully used its formidable navy to control the straits of Malacca and Sunda and thereby much of the maritime trade with China. In comparison, the Cholas only managed diplomatic missions to the Song Court in 1015, 1033, and 1077 – with a failed mission in 1020 due to the death of the envoy en route. Moreover, there is a lot of evidence to suggest that Sri Vijayan envoys controlled much of the communication with the Song court, leading to some confusion from Song officials into the exact nature of the Chola – Sri Vijayan relationship, indeed giving the impression that the Chola Empire was a vassal state to Sri Vijaya.


Whether it was because of the Sri Vijayan interference with the Cholas’ trade with China, or whether it was a natural development of the military expansion of the Cholas during the early decades of the 11th century, or whether it was just because Sri Vijaya was merely there – after all, Rome and Carthage could have happily co-existed, could they not? – the Chola Empire launched a massive naval raid against Sri Vijaya in 1025, probably leading to the temporary collapse of the Sri Vijayan Empire. In 1028, the Chinese Emperor Renzong would complain that foreign shipping hardly ever visited Canton anymore. But, for whatever reason, the Cholas chose not to convert their military success into political dominion and Sri Vijaya would soon recover.


It is hard to say whether Chinese officials properly understood the difference between the Chola and the Sri Vijayan Empires, especially if the Sri Vijayans, as already mentioned, intentionally muddied the waters. Some sources state that both the Cholas and the Sri Vijayans sent diplomatic missions to China in 1077. Curiously, the Chinese transliteration of the Chola ruler who ordered the diplomatic mission of 1077 better fits a Sri Vijayan ruler of the time. And both the Cholas and the Sri Vijayans practised the sadian ritual, the casting of the pearls. Was Qilolo a Sri Vijayan envoy then? Had Peng Cheng actually witnessed a Sri Vijayan diplomatic mission? Are both he and the Songshi, the written history of the Song Dynasty, wrong? We may never know.


(The author is a novelist with an abiding passion for Chinese history.)

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