The International Marine Contractors Association (IMCA) has published “Guidance on RADius Relative Positioning System” (IMCA M 224) describing the RADius microwave radar system. The development of dynamic positioning (DP) systems has grown over the past 35 years, with reliable and robust methods of positioning essential for safe vessel operations at offshore installations. This growth has in turn stimulated the development of DP position measurement sensors which have become more sophisticated as technology has allowed. “This new document is produced by IMCA as an aid to members and others using position reference systems and forms part of a series of documents on the available systems,” explains IMCA’s Technical Director, Jane Bugler.