Two short horn blast from a vessel means that she is turning port and one short horn blast that she is turning starboard
I intend to pass you on my starboard (right) side.
They intend to pass starboard side to starboard side.
One short blast of a boats horn can mean a couple of things.Horns are used to communicate with other boats to avoid collisions.If you are overtaking a boat from the rear, one short blast will let the other boat know that you are going to pass them on the starboard side, two blasts indicate passing on the port side. The other boat should return your one blast, or two blasts, to let you know that they are aware of you and acknowledge your intentions.If you are heading straight towards another vessel, one blast will indicate you intentions of passing port to port. If you pass starboard to starboard then two blasts are required. The last situation is if you are going to be crossing in front of another boat. Remember, the boat coming from the right has the right of way. Giving one blast lets the boat to your right know that you see them and are going to give way to them, again all these signals should be acknowledged by the other vessel. If you do not receive a return signal, assume they are either drunk or do not see you. These rules are for inland waters, such as lakes rivers, bays, harbors and the like. Different rules may apply when you are on the high seas.One short blast of a boat horn means that the boat is altering course in a starboard direction. One long blast means that the boat is nearing a bend and cannot see oncoming boats.
on short blast
you better get off that ship!!Two short blasts means that the vessel intends to leave you on it's starboard side. If you are in international waters it means " I am altering my course to port"
Rules of the RoadSound and light signalsRule 34Maneuvering and Warning SignalsInternational (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 am operating astern propulsion"(This is the ONLY action in Inland)
Passing on your right side.Signals are (number of blasts):1. Passing you on your left (port) side2. Passing you on your right (starboard) side3. I am moving backwards (astern)4. Danger, don't do that (answer to the other three if dangerous)One short blast means 'I am changing course to starboard.'Two short blasts mean 'I am changing course to port.'Three short blasts mean 'I am operating astern.'Two prolonged blasts followed by one short blast to mean 'I intend to overtake you on your starboard side';Two prolonged blasts followed by two short blasts to mean 'I intend to over-take you on your port side.'A long blast every two minutes is used when operating in fog.
The sound signals that it is a sailing vessel underway when you hear one prolonged blast plus two short blasts every two minutes.
Rules of the RoadSound and light signalsRule 34Maneuvering and Warning SignalsInternational (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
When two boats approach each other, they use horn blasts to signal the other about their intentions when it comes to moving to avoid collision. 5 short blasts indicates that the signaling boat is unsure about what the other boat is doing.
Rules of the RoadSound and light signalsRule 34Maneuvering and Warning SignalsInternational (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 am operating astern propulsion"(This is the ONLY action in Inland)