With the increasing frequency of global marine resource development and maritime activities, maritime safety and environmental monitoring are facing unprecedented challenges. To respond to sudden risks and improve early warning efficiency, more and more countries are deploying smart warning buoy systems and using wireless communication technology to achieve real-time transmission and coordinated response of maritime data. Traditional buoys are limited by data silos, while the new generation of smart warning buoys leverage integrated communication technology to become key nodes in the marine IoT network.
Smart buoys: more than just "floating warnings"
Traditional warning buoys primarily use color, lights, or sounds to alert vessels to avoid hazardous areas such as reefs, channel change zones, or construction areas. However, under adverse sea conditions, at night, or at long distances, the effectiveness of these passive warning methods is limited.
Smart warning buoys integrate multiple sensors (such as wind speed, wave height, water temperature, ocean currents, and positioning devices) with communication modules, enabling autonomous sensing, data processing, wireless communication, and fault self-diagnosis. For example, intelligent buoys deployed around oil and gas platforms in the North Sea can not only detect abnormal wave changes in real time but also transmit data back to land-based command centers via satellite or 4G/5G networks or directly send it to nearby vessels.
Wireless transmission: the key to overcoming the "information silo" effect
In open seas, one of the biggest technical challenges faced by buoys is the "information island" problem: data collected by devices is difficult to transmit and share in a timely manner. Wireless communication technology is the key to breaking this bottleneck.
Currently, internationally, buoys primarily use the following wireless transmission methods:
• Satellite communication (such as Iridium, Inmarsat): suitable for offshore areas, with wide coverage and strong adaptability;
• Cellular communication (e.g., 4G/5G): Suitable for nearshore areas, offering high speeds, low latency, and support for high-definition video and large-data-volume transmission;
• LoRa and wireless relay networks: Establish a local low-power wireless network among multiple buoys to achieve "networking" of buoys, enhancing overall monitoring capabilities;
• AIS broadcasting (Automatic Identification System): Enables integration with ship navigation systems to enhance warning functions.
For example, the "MarTERA" project supported by the EU's Horizon 2020 program has deployed a series of wirelessly interconnected smart buoys along the Nordic coastline for port automatic guidance, pollution warning, and ecological protection, and shares real-time data with multiple countries via a cloud platform.
Application scenarios are increasingly diverse
From international experience, real-time monitoring supported by wireless transmission via smart warning buoys has been widely applied in multiple critical fields:
• Arctic shipping lane safety: Canada and Russia have deployed buoy networks along Arctic shipping routes for ice condition monitoring and emergency alerts;
• Marine disaster warning: Buoy systems in Japan and the United States can provide minute-level warnings for tsunamis triggered by earthquakes;
• Environmental monitoring: Buoys in the Mediterranean and Caribbean regions can monitor water quality, algae concentration, and red tide occurrences in real time;
• Marine construction safety: Port-dense regions like Singapore use smart buoys to ensure the safety of large vessel operations and reduce accident rates.
Currently, the Global Ocean Observing System (GOOS) under the United Nations Educational, Scientific and Cultural Organization (UNESCO) is promoting the sharing of ocean buoy data among countries to enhance the accuracy of global ocean climate models. Meanwhile, with the rapid development of low-orbit satellite communication technology and the mature application of edge computing at the buoy end, future buoys will no longer be mere data relays but will possess intelligent analysis and emergency decision-making capabilities as "maritime micro-sentinels."
Countries such as China, the United States, Norway, and Japan are actively advancing the standardization of intelligent buoys and system interoperability, aiming to establish an open, interconnected, secure, and efficient global marine monitoring network.
With the development of IoT technology, the wireless transmission capabilities of intelligent warning buoys will continue to upgrade, laying a solid foundation for the construction of a comprehensive, real-time marine monitoring system.
