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The present training video film was developed to supplement this training booklet and with the ultimate intention to provide a proper introduction to the major technologies making up Target Tracking Devices and to describe how they relate to each other. The technologies described are the ARPA, AIS and ECDIS. The training is primarily intended for the deck team - both junior and senior officers. Radar sweeping the surrounding sea, pinpointing ships, coastlines, every sweep plotting a new situation; by combining this information with data on your own course and speed, it has long been possible to create a vector triangle identifying any targets. In busy shipping lanes with dozens of vessels showing the same sea space and some vessels travelling at high speeds, calculations need to be swift and accurate.