MT SEEB, an Iranian-owned Very Large Crude Carrier (VLCC)

At about 2100hrs on 04 Jan 2012 (Singapore time), the Maritime and Port Authority of Singapore (MPA) received a report that a Singapore-registered containership, Kota Tenaga and a Malta-registered VLCC, M/T SEEB had collided at about 2.7km south of Pulau Sebarok.

The master of Kota Tenaga reported that about 5 metric tons of marine fuel oil had spilled into the sea.  An inter-agency effort, coordinated by MPA, was immediately activated to contain and clean up the oil spill. The spillage of oil from Kota Tenaga was contained and Kota Tenaga was moved to Raffles Reserved Anchorage. An oil boom was laid around the vessel as a precaution. There is no report of injury to crew members.

A total of 12 craft was activated to monitor and clean up the oil spill. Non-toxic and biodegradable oil spill dispersants were used to break up patches of oil sighted in the vicinity of Pulau Pawai, Pulau Senang, and Raffles Reserved Anchorage.

MPA continues to monitor the situation closely and will respond to any sighting of oil patches.

Traffic in the port and the Strait of Singapore remains unaffected.

MPA is investigating the cause of the collision.

At the time of the incident, the vessel was reported to be on her way from Singapore to Sumbawa, Indonesia. There are 14 crew, all Thai nationals, on board the tanker. All the crew were reported to have been rescued by the Indonesian Navy.

The vessel is owned and operated by AB1 Shipping Pte Ltd.

Photo source: Shipspotting

The Nautical Institute’s AIS error reports webpage tells us:

I have observed too many vessels with wrong data transmitted by their AIS. Mostly headings are not correct, but the main problem – is offset correction given by GPS. If GPS has offset correction (set by navigator on bridge) then AIS transmits wrong vessel’s position (equal to offset).

You can watch now on ECDIS some vessel in the harbour is not alongside the berth but e.g. stays in the middle of harbour instead. The greater offset – the greater error. Some of the vessels have offset from 0.02 up to 0.3 nautical mile, and if you meet such vessel in Singapore Strait – then AIS information maybe very dangerous, as you can mistake such target with others.

I like AIS information very much, but when I watch such a picture on ECDIS – I would like to suggest to all navigators not to use on their GPS any offset. Nowadays GPS is reliable information and better to plot position on sea chart manually using satellite-derived calculation instead of inserted offset into GPS unit.

Lesson Learned: check the GPS offsets on your ship and assure you are sending accurate data… or you could confuse surrounding ships. Also keep an eye on NI’s AIS error reports webpage for continuous updates on the reliability of AIS.