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Search and Rescue (SAR) is searching for and providing help to people indanger. In the UK, SAR teams are typically charities with limited resources,and SAR missions are time critical. Search managers need to objectively decidewhich search assets (e.g. helicopter vs drone) would be better. A key metric inthe SAR community is effective sweep width (W), which provides a single measurefor a search asset's ability to detect a specific object in specificenvironmental conditions. Tables of W for different search assets are providedin various manuals, such as the International Aeronautical and Maritime SAR(IAMSAR) Manual. However, these tables take years of expensive testing andexperience to produce, and no such tables exist for drones. This paper uses theVienna Development Method (VDM) to build an initial model of W for a known case(helicopters at sea) with a view to predicting W tables for drones. The modelcomputes W for various search object sizes, helicopter altitude and visibility.The results for the model are quite different from the published tables, whichshows that the abstraction level is not yet correct, however it produced usefulinsights and directions for the next steps.

Modelling Maritime SAR Effective Sweep Widths for Helicopters in VDM