LOC can offer a fast and cost-efficient service for clients that need an accurate presentation of any collision, allision, grounding or stranding overlaid onto a chart, site plan or other geo-referenced image that uses a single source or amalgam of different sources of data, typically from VDR (Voyage Data Recorders) and AIS (Automatic Identification Systems), or ECDIS (Electronic Chart Display and Information System) and VTS (Vessel Traffic Services).

LOC uses MADAS (Marine Accident Data Analysis Suite), which was first created for the MAIB (Marine Accident Investigation Branch) and NSTB (National Transportation Safety Board) to meet their specific requirements for accident investigators and provides a unique range of features to assist in the replay and analysis of digital data of marine incidents and accidents, which includes:

  • Animated replay (variable speed) of the position data
  • User-definable scaled icons for the ship(s) involved.
  • Synchronised display of NMEA data (e.g. depth, wind speed and direction, engine and rudder orders and response etc.), with separate gauge or bar graph formats available for engine and rudder data.
  • Synchronised replay of bridge audio and VHF radio recordings (with separate volume and pan controls for each channel)
  • Synchronised replay of radar recordings that can be scaled/overlaid so that they track with the ship’s position on the chart. This can be very useful to identify radar returns from non-AIS equipped vessels, and locate their position on the chart.
  • Synchronised replay of video data (e.g. from CCTV which is becoming increasingly available for incidents that occur in port, or video camera/smart phone footage)
  • Trend plots of user-defined graphs of multiple parameters (such as speed, depth, engine speed etc.) against time. A cursor is linked to the main chart replay, making it very easy to move the replay to a point in the data of particular interest (such as changes in depth, helm, engine setting, speed or wind speed, etc.), and then replay the data from that point.
  • Historical position/orientation plotting of the ship’s position/orientation at specific intervals in the past can be included on the track plot to provide an easy way of showing how the ship’s position and orientation changed over a period of interest.

If required, LOC can extend this service to provide legal advice as to the cause of the accident based on the MADAS replay and other disclosure documentation.

This highly versatile technology allows LOC’s marine investigators to provide a realistic replay of events fully integrated with the vessel instrumentation, audio, radar images and video (where appropriate) for a more reliable understanding of the chain of causation.

Marine Accident Investigation / in the news

/ on the 20.Oct.16


LOC’s 9th annual technical seminar held in Trinity House   LOC Group welcomed over 75 attendees to its popular annual technical seminar on Thursday 20 October, 2016.  This year’s event was titled “From Cradle to Grave – the Hazardous Life of a Sh...

Why Do We Need Accurate Marine Accident Investigation?

Accuracy is absolutely crucial in marine accident investigation because the stakes are so high. In fact, people's lives can depend on the investigation revealing the true reason for the accident.Civil or Criminal LiabilityThe results of the ...