This introduction presents an overview of the key concepts discussed in the subsequent chapters of this book. The book examines the role of Marine Spatial Planning for attending to the present and future use of seas in ways that may better protect and conserve them. It draws on quantitative methods and a classification system for assessing the values people assign to seascapes. The book explores a heritage project with a difference: the restoration and sailing of the nineteenth century whaling vessel the Charles W. Morgan. It also explores how technology (a windsurfer) can dissolve the boundaries between us as humans and the more-than-human sea and its energies. The book also draws on extensive offshore research with seafarers to give voice to their experiences of working with the sea. It considers the varying engagements and experiences that can provide oceanic knowledge, awareness and evoke environmental action.