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one prolonged blast
one prolonged blast
loud
one prolonged blast
3 short blasts
3 short blasts
The sound signal that you should hear when a power boat is in the fog is one prolonged blast at intervals of no more than 2 minutes.
Stay out of the way! One prolonged blast is the whistle signal for a ship leaving a berth or in a blind bend in a channel.
People lean forward to get closer to the sound so they can here it better. Sometimes they do this to signal others they are trying to hear hoping the others will get quiet.
The sound signal must firstly be changed into an electrical signal.
five or more short blasts
five or more short blasts