Questões da Prova Marinha - 2017 - Quadro Complementar - Segundo-Tenente - Ciências Náuticas - Área de Náutica
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When a Search-and-Rescue Operation is in progress, the RCC or the OSC will instruct other vessels in the vicinity to keep radio-silence, unless they have messages about the accident. Radio silence is imposed to other vessels by the phrase