Radar and ARPA (Automatic Radar Plotting Aids) are standard systems on all commercial vessels and are widely used in the leisure maritime sector. This fully revised new edition covers the complete radar/ARPA installation, including AIS (Automatic Identification System) and ECDIS (Electronic Chart Display & Information Systems). It serves as the most comprehensive and up-to-date reference on equipment and techniques for radar observers using older and newer systems alike. Suitable for use both as a professional user’s reference and as a training text, it covers all aspects of radar and ARPA technology, its use and its role in shipboard operations. Reference is made throughout to IMO (International Maritime Organisation) Performance Standards, the role of radar in navigation and in collision avoidance, and to international professional and amateur marine operations qualifications.