Marine safety investigations & reports

Technical assistance to the Office of Transport Safety Investigation (NSW) in the analysis of positional information - close quarters event off Bradley Head, Sydney Harbour NSW on 25 July 2012

Investigation number:
Status: Completed
Investigation completed


On 25 July 2012 a close quarters incident occurred between two ferries, a fishing vessel and an Australian Navy vessel off Bradley Head, Sydney harbour NSW.

The Office of Transport Safety Investigation (OTSI) New South Wales was responsible for investigating this occurrence. The OTSI requested assistance from the Australian Transport Safety Bureau (ATSB) in the display and presentation of vessel positional data. To assist the OSTI and protect any information supplied, the ATSB initiated an External Investigation under the Transport Safety Investigation Act 2003.

The OTSI provided the ATSB with Automatic Identification System (AIS) data and radar vessel positional data. The ATSB subsequently used the Avenca Marine Accident Data Analysis Suite (MADAS) to display and present the position of the respective vessels and provided that information to the OTSI investigators.

The OSTI has finalised its investigation of this occurrence, and a report is available from the OTSI website, or from the OTSI directly.


General details
Date: 25 July 2012   Investigation status: Completed  
Time: UTC+10 hours   Investigation level: Systemic - click for an explanation of investigation levels  
Location   (show map): Off Bradley Head, Sydney Harbour    
State: New South Wales    
Release date: 24 May 2013   Occurrence category: Incident  
Report status: Final   Highest injury level: None  
Last update 03 April 2020