A guide for family and historians, archivists, librarians and medal collectors. It explains the range of records and secondary sources which can be used to trace genealogical and career information in relation to men and women who have served in the Royal Navy and the naval reserve and auxillary forces formed to assist it from 1660 to modern times. The guide aims to help researchers identify key and overlooked sources vital to tracing naval ancestors. It includes sections on recently released Royal Naval Reserve, Royal Naval Air Service, Royal Naval Volunteer Reserve, Royal Naval Division, Queen Alexandra's Naval Nursing Services, and Women's Royal Naval Service First World War service records.