תבלוט עיכוב לירוק three short blasts of a boat horn מחלת ים מגרש משחקים אסטרולבה
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Short Cuts: Why do horn signals vary when boats pass under Aerial Lift Bridge? - Duluth News Tribune | News, weather, and sports from Duluth, Minnesota
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Examples of Sound Signals Used for Encountering Situations
Sound Signals - Boat Safety in NZ - Maritime New Zealand - YouTube