This section is an instruction on the use of the 'History' function on the RIS. This includes information on how to search for vessels, detailed descriptions on the information that can be accessed in vessel dossiers, and how to use the tools.
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'History' is a tool for investigating vessel movements and vessel activity.
The tool can be accessed via the left side of the screen, and the 'History' icon
The function needs three types of input:
- A 'Date Range'
- A 'Sample Rate' (meaning the interval of datapoints)
- A 'Vessel Identifier'.
For 'Vessel Identifier', you need to input IMO and/or MMSI numbers.
If using both, separate the numbers by a space. If you require information on multiple vessels, add additional vessels to the line below.
When pressing 'Get History', you will get a complete overview of available data for the vessel.
On the map, you will see the vessel, and the vessel track for the timeframe you have selected. You will also see the dossier for the vessel.
On the 'History' menu on the left, you can export and download the vessel history.
There are several selections available to highlight and investigate the vessel activities:
- Investigate 'AIS data gaps' can be used to identify if, and where, AIS has been turned off or the vessel otherwise has failed to transmit an AIS signal. These gaps can be selected and adjusted down to 1-hour gaps in the AIS signal.
- In 'Visualization Options', you can choose how and what to view on the map. The AIS gaps can be toggled on and off in 'Visualization Options' and will be presented as red lines on the AIS track. Merged and stationary points enable you to see, if the vessel has been stationary inside a number of positions on the map, for extended periods of time.
- 'Results' will give you the basic data for the vessel.
- 'Heatmap Key' is the indicator for the heatmap function, which can be toggled on in 'Visualization Options' – the heatmap is based on the increasing density of AIS broadcast, i.e. where the vessel has sent the most AIS signals.
