סיבוב ועגול אלמנט לגרגר three short blasts of a boat horn רו סטטי יתרון
Sound Signals Used to Alert or Warn
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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Distress Signal Requirements for Boaters BOATsmart! Knowledgebase