Sailboat
During periods of restricted visibility, vessels must emit one prolonged blast followed by two short blasts every two minutes to signal their presence and intentions to other nearby vessels. This sound signal helps ensure safety and awareness in conditions where visual communication is limited. The prolonged blast alerts other vessels of the ship's position, while the two short blasts indicate that the vessel is underway. These signals are part of the International Regulations for Preventing Collisions at Sea (COLREGs).
In restricted visibility, a power-driven vessel under way is required to sound one prolonged blast followed by two short blasts every two minutes. This signal helps to indicate the vessel's presence to other nearby vessels in low visibility conditions. The prolonged blast lasts for about four to six seconds, while the short blasts are approximately one second each.
One prolonged blast followed two short blasts, every two minutes, not to exceed two minutes. Rule 35-Sound Signals in restricted visibility.
In restricted visibility, a power-driven vessel underway is required to sound one prolonged blast followed by two short blasts every two minutes. This signal indicates the vessel's presence and helps to communicate its intention to other vessels in the vicinity. The prolonged blast lasts for about four to six seconds, while each short blast lasts for about one second.
In restricted visibility, a vessel should use sound signals to communicate its presence and intentions. According to the International Regulations for Preventing Collisions at Sea (COLREGs), a power-driven vessel should sound one prolonged blast followed by two short blasts at intervals of not more than two minutes. Sailing vessels should sound one prolonged blast followed by two short blasts at the same interval. Additionally, vessels at anchor must ring the bell for five seconds at intervals of not more than one minute.
The sound signal of one prolonged blast followed by two short blasts every two minutes indicates that a vessel is restricted in its ability to maneuver. This signal is used to alert other vessels in the area of the restricted vessel's presence, especially in low visibility conditions like fog. It is important for nearby vessels to be cautious and maintain a safe distance from the restricted vessel.
One prolonged followed by one short is NOT a signal defined by International Regulations for Preventing Collisions at Sea, 1972 (72COLREGS). Unless you are are leaving a dock or berth (one prolonged) then immediately arranging a port to port passage. Unless that is the case there is no such thing as 1 prolonged followed by 1 short.
When operating a power-driven vessel in conditions of restricted visibility, you should take several precautions. First, reduce your speed to a safe level and maintain a lookout for other vessels and hazards. Use sound signals to communicate your presence, such as one prolonged blast followed by two short blasts if you are underway. Additionally, ensure you are aware of your vessel's position and use radar or other navigational aids to enhance situational awareness.
In restricted visibility, a power vessel underway must give way to vessels constrained by their draft, such as a ship in a narrow channel. It is also required to sound appropriate signals, typically one prolonged blast followed by two short blasts, to indicate its presence. Additionally, the vessel must maintain a safe speed to avoid collisions and be prepared to take evasive action if necessary. Following the International Regulations for Preventing Collisions at Sea (COLREGs) is essential in these conditions.
Rules of the Road.Rule 35InternationalSound Signals in Restricted visibility.(c) A vessel not under command, a vessel restricted in her ability to maneuver, a vessel constrained by her draft, a sailing vessel, a vessel engaged in fishing, and a vessel engaged in towing or pushing another vessel shall, instead of the signals prescribed in paragraphs (a) or (b) of this rule, sound at intervals of not more than two minutes three blast in succession, namely one prolonged followed by two short blast.
Rules of the RoadRule 35Sound Signals in Restricted Visibility(C) A vessel not under command, a vessel restricted in her ability to maneuver, a vessel constrained by her draft, a sailing vessel, a vessel engaged in fishing, and a vessel engaged in towing or pushing another vessel shall..........sound at intervals of not more than two minutes, three blast in succession, namely one prolonged followed by two short blasts.
None, since there are no symbols and so nothing which can be "immediately followed by symbol".None, since there are no symbols and so nothing which can be "immediately followed by symbol".None, since there are no symbols and so nothing which can be "immediately followed by symbol".None, since there are no symbols and so nothing which can be "immediately followed by symbol".