Final Report of the IALA Conference held in Veldhoven, The Netherlands, 16-30 June 1990.Contents include: a list of participants and Technical Sessions: IALA Overview 1985-1990 which covers Marine Marking Systems, Radionavigation Systems, Vessel Traffic Services, Reliability and Availability of Aids to Navigation, Dictionary and Documentation Committee, Relations with International Organisations; System Approach and Management Issues; Special Session on the IALA Navguide; Fixed and Floating Aids to Navigation; Special Session on Energy Sources including a project for the creation of an independent battery testing laboratory; Radionavigation, Remote Control and Electronics; Special Session on Radio Aids to Navigation including radio beacons; Aspects of Vessel Traffic Services (VTS); Civil Engineering issues covering new constructions, maintenance and alteration of existing structures, civil engineering problems linked with unattended structures.