loud
3 short blasts
one prolonged blast
one prolonged blast
When a boat is leaving the dock, the standard signal is to sound one long blast on the horn. This signal alerts other boats and nearby individuals of the vessel's intention to depart. Additionally, it's important to visually ensure that the path is clear and communicate with crew members to avoid accidents. Following these practices helps maintain safety on the water.
In restricted visibility, a power-driven vessel underway is required to sound one prolonged blast every two minutes. This signal alerts other vessels to its presence and intentions. Additionally, if the vessel is making way through the water, it may also sound two short blasts after the prolonged blast.
one prolonged blast
A vessel that is backing up typically uses a series of short blasts on its horn to alert other boats of its intention to maneuver in reverse. This sound signal consists of three short blasts, which indicate that the vessel is preparing to move backward. This is part of the International Regulations for Preventing Collisions at Sea (COLREGs) to ensure safety on the water.
A vessel of more than 100 meters in length that is at anchor must sound a fog signal consisting of one long blast followed by two short blasts at intervals of not more than one minute. This signal alerts nearby vessels of its presence in reduced visibility conditions. The long blast lasts for about four to six seconds, while each short blast lasts for about one second.
In restricted visibility, a power-driven vessel underway is required to sound one prolonged blast every 2 minutes. This signal is meant to indicate the vessel's presence to other nearby vessels in low visibility conditions. The prolonged blast lasts for about 4 to 6 seconds. This sound signal helps enhance safety by alerting others to the vessel's location, allowing for better navigation and collision avoidance.
A pilot vessel can sound an identity signal when it is approaching a ship to indicate its presence and intent to provide pilotage services. This signal typically consists of a series of short blasts on the vessel's horn, helping to identify it as a pilot vessel to other vessels in the vicinity. The signal is important for ensuring safe navigation and communication in busy waterways. Additionally, it can be used when the pilot vessel is departing from the ship after completing its duties.
Keeping his/her vessel and crew out of danger
A pleasure craft operator can moor their vessel to a signal only in cases of emergency or when it is necessary to avoid immediate danger. Otherwise, it is not recommended to moor a vessel to a signal as it may obstruct navigation or pose a safety hazard to other vessels.