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one prolonged blast
one prolonged blast
one prolonged blast
One prolonged blast
one prolonged blast
One prolonged blast should be sounded every two minutes.
one prolonged blast every 2 minutes
One prolonged blast should be sounded every two minutes.
One prolonged blast should be sounded every two minutes.
one prolonged blast
One horn blast every two minutes.
A bell ringing rapidly for 5 seconds every minute is the signal for a vessel at anchor in restricted visibility.