When a motorboat expresses its intention, action or needs the attention of other ships, it uses its horn to send out the following sound signals:
(1) A short sound-I'm turning right; When meeting other ships, it means "request to pick up the ship from our port"
(2) Two short notes-I'm turning left; When meeting another ship, it means "request to meet the ship from my starboard side"
(3) Three short tones-I am reversing or have a tendency to retreat.
(4) four short tones-disagree with your request.
(5) Five short sounds-doubt whether the other party has taken enough evasive actions to warn the other party.
(6) A long sound means "I'm leaving the berth" and "I'm crossing", requesting the attention of coming ships or nearby ships.
(7) Two long tones-I want to dock or I ask for a lock.
(8) Three sirens-someone fell into the water.
(9) One long and one short tone-when turning around, it means "I turn right"; When entering or leaving the main road, tributary or fork, it means "I'm going to turn right".
(10) One long tone and two short tones-when turning, it means "I turn left"; When entering or leaving a main road, tributary or fork, it means "I want to turn left or I want to turn left".
(1 1) One long sound and three short sounds-the tugboat informs the towed ship and rafts to pay attention.
(12) Two long tones and one short tone-overtaking needs to pass on the starboard side of the front ship.
(13) Two long and two short sounds-overtaking needs to pass through the port side of the front ship.
(14) One long, one short and one long tone-hope to contact.
(15) One long one short one long one short tone-agree to your request.
(16) One sound is long, two sounds are short, and one sound is long-please come to the ship and allow me to pass.
(17) A short beep, a long beep, a short beep-tell him to slow down or stop.
(18) A short tone and a long tone-I have slowed down or stopped.
(19) Two short sounds and one long sound-when visibility is poor, it means "I am a passenger ferry".
The "short sound" in the preceding paragraph refers to the flute sound lasting about 1 second, and the "long sound" refers to the flute sound lasting 4 to 6 seconds. The interval between flute sounds in a group of sound signals is about 1 second, and the interval between group and group sound signals is about 6 seconds.