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SOUND SIGNALS A Prolonged blast is 4 to 6 seconds duration n n n n n A Short blast is 1 second duration l DANGER SIGNALS ( at any time ) 5 short and rapid blasts l l l l l RESTRICTED VISIBILITY - Fog, Rain, Snow, ... At intervals of less than 2 minutes signal as follows: Sailboat - 1 prolong blast and 2 short blast n n n n n l l Powerboats - 1 prolonged blast n n n n n Powerboats underway but stopped - 2 prolonged blasts n n n n n n n n n n P |