Singapore Strait

protection from navigation hazard

Guardian marked a hazardous wreck in the Singapore Strait. Over 8000 vessels were warned during 9 months of salvage work.


Singapore is the 2nd busiest port in the world with more than 2,500 vessels and 11 million metric tons of cargo movement every week.

The dredger Cai Jun 3 sank outside the inbound traffic lane in March 2017 and the wreck posed a significant hazard to shipping.

Vessels needed to be warned about the location of the wreck. Two guard vessels stationed 24×7 in the area were used to warn approaching vessels.


The Guardian system protected the wreck zone electronically from a shore location.

Caution and warning messages were sent to vessels’ navigation systems if they were on a collision course with the wreck.

Three monitoring zones at 5 nautical miles, 2 nautical miles and 500m were set up for multiple levels of alerts.


Cost saving

The Guardian solution enhanced shipping safety while helping save the considerable cost of guard vessels.

Real time and automated

Its automated real-time solution determined risk situations and proactively triggered warning signals.

Minimising impact

The Guardian system helped ensure smooth transit of vessels through one of the busiest shipping lanes in the world while the salvage work was being carried out.


Over 8000 vessels automatically alerted of hazardous wreck while entering Singapore Strait

Vesper Marine’s innovative Guardian solution successfully helped alert over 8000 vessels over 9 months to avoid navigating around a dangerous shipwreck at Singapore port. The salvage operation team conducted a safe and cost-effective salvage in the busy waterways managed by the Maritime and Port Authority of Singapore (MPA). At the same time, it helped Hanseatic Underwriters reduce the overall cost of the salvage operation. The operation was a significant success, considering Singapore is one of the world’s busiest ports, with particularly dense and hard to navigate waters and a constant stream of ships criss-crossing the passage to pick up loads or refuel.

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