Distribution and density of wrecksDistribution and density of wrecksData relating to casualties records events that caused the loss or damage of a vessel but not necessarily its wrecking. These events can include vessels burnt, grounded, cast away, scuttled, prizes taken in battle, and wrecking, all of which may have an impact on the potential for wreckage or debris on the seabed. Numerous journeys recorded were related to descriptions of incidents at sea which did not necessarily lead to a wrecking event. Casualty events therefore had to be recorded to avoid breaking up related information.
The casualty data for England’s Shipping recorded pre-1730 events in the database to characterize the locations and manner of loss of the vessels, which was also plotted in the GIS. Data was extracted from secondary sources such as Larn's Shipwreck Index of the British Isles, Rodger's Safeguard of the Seas, and Hepper's British Warship Losses in the Age of Sail.
Many of the records were inferred from historic descriptions rather than based on archaeological evidence, and tended to be vague. The casualty locations mapped were given 5 kilometers buffers to reduce the uncertainty of the co-ordinates provided. The number of casualty events recorded in the database is currently too small to identify significant trends or relationships with other data.

Although casualty data can be obtained from the National Monument Record office, the recording of casualty data was necessary to maintain the relationships described between events. Further recording of the relationships between journeys and casualty events such as groundings and wrecking may in the future uncover trends in the data.