Browse screenshots of Debrief capabilities, and click on each image for more details.
Click on each category below to filter the capabilities.

  • XY Plots
    Viewing XY plots
  • Charts
    Context via nautical charts
  • Reference data
    Bathy data, for informed analysis
  • Grid editor
    Gridded data editing
  • Track grooming
    Track grooming for data quality
  • Dynamic Analysis
    Dynamic replay for visualisation
  • Export
    Export into analysis reports
  • Manual TMA
    Conduct Manual TMA
  • Automatic TMA
    Genetic Algorithm-driven TMA
  • Narrative Integration
    Integrated narrative viewing


Open Source

Debrief’s Open Source license means that it is (and always will be) completely free to use, plus you’ll never suffer "Vendor lock-in"

Multi Platform

Debrief’s Java foundations mean that it will run on 32 and 64 bit versions of MS Windows, Apple OSX and Linux.


Under continuous maintenance since 1995, the algorithms underpinning Debrief have had around two decade of testing and development.


A suite of custom data views mean that challenging analysis tasks become easy and straightforward, allowing the analyst to focus on considered observations rather than collating data.


Currently in use by Navies, Governmental and non-Governmental organisations around the world, the Debrief software has unprecedented levels of reliability.


This well documented, standards adherent application is easy to maintain, either within your own organisation or with commercial contracted support.


How to get it

Getting Debrief is really easy. Just follow these simple steps:

  1. Navigate to the Debrief download page, and select the correct version (First find your Operating System [Windows, OSX, Linux] select either 32bit or 64bit).
  2. Unzip the downloaded folder, and move it into a chosen location (this could be in Program Files or some other location).
  3. Run the DebriefNG executable.
    Note: you will need to have a Java JRE installed on the system to run Debrief, you can get it from

Getting Started

  • The Debrief NG User guide is a useful reference for determining where to find something, the overall capabilities of the tool, and assorted reference guidance.
    • Manipulating track data
    • Analysing data
    • Exporting data
    • Handling buoyfields
    • Symbol sets
    • External data sets
    • Exercise planning
    • Viewing narratives
    • Using chart backdrops
    • Debrief video recording
    • Analysing sensor data
    • Management of TMA and TUA

    Please, visit the Debrief Tutorial page (also available as pdf for easy printing) to know more about the topics listed above.


A series of online cheat sheets is distributed with DebriefNG to guide you through a series of common tasks such as:

  • Loading data into Debrief
  • Analysing narrative data
  • Generating missing track data
and can be accessed by selecting Debrief Cheat Sheets from the Help menu in Debrief NG.

You can work through these tutorials within Debrief, or click here to view a printable version.

Get involved

There are a number of communications channels for Debrief, depending on the nature of the content.

As you will have seen in the About section above, a Twitter stream shows recent project changes and updates in detail (#debrieftool).

If you want to take part in the development of Debrief, maybe to fix a frustrating UI gotcha, or to read a new file format, then why not Fork the Debrief repo, make your change, then submit a Pull Request (PR) for the project maintainer to integrate the change.

For any other queries, please use the email address in the Contact section below, which will be forwarded directly to us.




The Debrief project has its origins back in 1995 in the Maritime Warfare Centre . Its goal was to act as a desktop viewer for results produced by the MWC's ASSET submarine simulator.

In Summer 2000 the Maritime Warfare Centre committed to switching the Debrief application toOpen Source status.

At the end of 2000, Ian Mayo, the developer and project manager of Debrief, left full-time employment at the Maritime Warfare Centre to set up his own software development consultancy, PlanetMayo Ltd, though he continued to support the MWC.

Since 2008 support contracts have also been provided to DSTL, where Debrief now represents the standard tool for maritime track analysis.

Want to know more? Visit the Debrief History page for the details.


For those visitors unfamiliar with Debrief and its background, there is an entire FAQ page that provides some useful pointers and background information.

Here are the core topics you will find browsing through this rich resource:

If you have queries about any of the topics listed above, visit the Debrief FAQ page, or this search box:


Report a bug / feature request

If you find (or suspect you've found) a bug in Debrief, or you wish to request a new feature, then please register it at the bug-database.

It's also possible to browse through the list of tickets relating to Debrief - in case you can add evidence/ammunition to any issues.

Reporting a bug

To report a bug, you must first register at GitHub. Once registered, you can click on the 'New Issue button, and submit a request for a bug-fix or new features. The items are then tracked, and provided an e-mail address was provided, the submitter is kept informed of the progress of the submission.

Requesting a new feature

The procedure for requesting new features is much the same as for Reporting a bug, described above. The time-frame for resolution of feature-requests is normally longer than for bugs, but if maintenance effort is being performed in a related area of Debrief, and one of the Debrief Project Sponsors is supportive, then the new feature should get added quite quickly.

For more details, please visit the Providing feedback page of the Debrief Tutorial.

About us

PlanetMayo Ltd
"New technologies, implemented well"


ISO 9001 accredited Personal Service Company providing focussed delivery of maritime and military software solutions. Specific tasks are outsourced to a team of specialists in the UK and abroad, some of whom have provided contracted support for over 10 years.

Projects have been successfully delivered to UK Industry, DSTL, the Royal Navy, and Other Government Departments.

Get In Touch


Open Source Java Maritime Analysis Application


Send us an email:


Go on, tweet us: @debrieftool