Vision is essential to address maritime activities, and there is a lot of information to handle collectively. Augmented Reality (AR) is well suited to answer these challenges, but operational needs introduce specificities that distinguish AR solutions from those of other domains: multiple long range panoramic or pointed sensors, various data and video fusion sources, native video quality with low latency, crew shared situation... This paper describes the operational needs related to a system named VISIPROT® (VISual Information system for PROTection) dedicated to asymmetric warfare, which means ship protection against terrorist attack, and navigation. It relates the maturation of a first real-time at-shore demonstrator (early prototype without full capabilities) that allowed three French navy mariners to operate it in defense scenarios against a speed boat during an experiment. VISIPROT aims to be on board in 2016 and introduces a dedicated AR collaboration concept based on a shared "visual situation". This visual situation corresponds to tactical and nautical situation displayed on the video provided by the 360° on board surveillance sensor. It allows users to coordinate easily with others local, remote or distant users. It allows sharing situational awareness, complying with engagement rules, and following decisions.
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