The region is prone to "Sumatras"—sudden, violent thunderstorms with heavy rain that can reduce visibility to near zero in minutes.
Effective passage planning must account for the unique geographical and operational hazards of the region: passage planning guide malacca and singapore straits pdf
Under IMO Resolution MSC.73(69), vessels over 300 GT or 50 meters in length must report to the relevant Vessel Traffic Services (VTS) when entering the reporting area. The region is prone to "Sumatras"—sudden