Changes in the depths of waters, particularly the waters in the northern approach to the Straits of Malacca and Singapore were reported following the earthquake/tsunami incident in the Indian Ocean and the Andaman Sea on 26 December 04. There has been close liaison between the Hydrographic offices of Indonesia and Singapore to monitor the situation. Ships transiting the area have also been asked to report any changes in water depths.

Since the initial unconfirmed reports on 6 January, many ships have passed the area. No reported changes in water depths have been received and shipping traffic through the Straits remains smooth.

However, as a precaution, ships transiting the Straits should continue to listen for broadcast of changes in depths, to turn on their echo sounders to check the depths of water and to advise the coastal VTS Authority of any depths less than charted.

The Maritime and Port Authority of Singapore (MPA) will continue to monitor the situation in the northern approach to the Straits of Malacca and Singapore together with the Indonesian Hydrographic office and the industry.