Two ships were deployed for a measurement campaign conducted by the DLR Institute of Communications and Navigation – the rescue vessel ‘Hermann Marwede’, operated by the German Maritime Search and Rescue Service (Deutsche Gesellschaft zur Rettung Schiffbrüchiger; DGzRS) and the multipurpose ship ‘Neuwerk’, operated by the Cuxhaven Waterways and Shipping Administration (Wasser- und Schifffahrtsamt Cuxhaven; WSV). The researchers sent signals between the ships at broadband frequencies to investigate how the waves, the vessels themselves and other factors influenced transmission.