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19,263 Lượt xem · 24/09/06
RiverNavigationRadar
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5 River Navigation, Radar, will describe how to use recreational marine radar sets for river navigation based on years of use on commercial vessels. It will cover history, types, adjustment and use as an aid to navigation and for collision avoidance.
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19,263 Lượt xem · 24/09/06
