Rules of the Road
Sound and light signals
Rule 34
Maneuvering and Warning Signals
International (Signals of Action)
(a.) When vessels are in sight of one another, a power driven vessel underway, when maneuvering as authorized or required by these rules, shall indicate that maneuver by the following signals on her whistle.
-One short blast to mean "I AM altering my course to starboard";
-Two short blasts to mean "I AM altering my course to port";
-Three short blasts to mean "I AM operating astern propulsion".
Inland (Signals of intent)
(a) When a power driven vessels are in sight of one another and meeting or crossing at a distance within half a mile of each other, each vessel underway, when maneuvering as authorized or required by these rules:
(i) Shall indicate that maneuver by the following signals on her whistle: one short blast to mean "I intend to leave you on my port side" (turning to starboard.); two short blast to mean "I intend to leave you on my starboard" (turning to port); and three short blasts to mean "I amoperating astern propulsion"(This is the ONLY action in Inland)
Read more: What_do_two_short_horn_blasts_from_another_vessel_mean_in_a_meeting_situation
They are indicating a dangerous situation exists
They intend to pass starboard side to starboard side.
Two short horn blasts from another vessel typically indicate that the vessel is maneuvering to overtake or pass you on your port (left) side. This is a signal used to communicate intentions between vessels to ensure safe navigation and avoid collisions. It’s important to respond appropriately by maintaining your course and speed, allowing the overtaking vessel to pass safely.
Two short horn blasts from another vessel typically indicate that the vessel is altering its course to starboard (right). In a meeting situation, this signal is a way for the vessel to communicate its intentions to maintain safe navigation and avoid collisions. It's essential for mariners to recognize and respond appropriately to such signals to ensure safe passage.
Means it's about to turn to port.
Five short blasts from another vessel's horn typically signal danger or a warning of an uncertain situation. It indicates that the vessel is unsure of the other vessel's intentions or maneuvers and is requesting clarification. In congested waters, it can also serve as a precautionary measure to alert nearby vessels of potential hazards. Always maintain vigilance and respond appropriately to such signals.
Two short horn blasts from another vessel typically indicate that the vessel intends to overtake you on your starboard side. This is a communication signal used in maritime navigation to ensure safe passing between vessels. It’s important for both parties to understand these signals to maintain safety and avoid collisions. Always respond appropriately to such signals to ensure clear intentions are communicated.
Five short blasts from a boat's horn typically signal danger or uncertainty about the intentions of another vessel. It is used to communicate that the vessel is unsure of the other boat's actions, often in crowded or congested waterways. This sound is part of the International Regulations for Preventing Collisions at Sea (COLREGs), which aim to enhance safety on the water.
Pilot vessel engaged in pilotage duties
Five short blasts on a horn in boating typically signal a warning or indicate that a vessel is unsure of another vessel's intentions, often in situations of restricted visibility or when navigating in close quarters. It can also mean that a vessel is backing up or has an emergency situation. This sound signal is part of the International Regulations for Preventing Collisions at Sea (COLREGs) and is important for maintaining safety on the water.
Five short blasts from another vessel's horn typically signal danger or an uncertain maneuver. It serves as a warning to nearby vessels that the signaling vessel is unsure of the other vessel's intentions or is indicating a potential collision risk. In maritime communication, this signal emphasizes the need for caution and awareness in navigating close quarters.
Five short blasts from another vessel's horn typically signal danger or an indication that the vessel is unsure of the other vessel's intentions. It serves as a warning to alert nearby vessels that they may be in a potentially hazardous situation. This sound signal is part of the International Regulations for Preventing Collisions at Sea (COLREGs) to promote safety on the water.