The sound signal that indicates to another boater to pass on your port side is one short blast of the horn. This is a standard maritime communication used to convey intentions between vessels. When you hear one short blast, it means the other vessel intends to pass you on its left side.
The danger signal
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.
One prolonged blast followed by two short blasts every two minutes is a sound signal used by vessels in fog or low visibility conditions. This signal indicates that the boat is under way and making way through the water. It serves to alert other vessels in the area of its presence and movement to help prevent collisions.
on short blast
one short blast
one short blast
one short blast
one short blast
one short blast
Five short blasts from a vessel typically signal a warning or indicate that the vessel is unsure of another vessel's intentions or position. This sound is often used in situations of limited visibility or when navigating in close quarters to communicate caution. It can also be a request for the other vessel to clarify their actions or maneuvers. In general, it's a call for increased awareness among nearby vessels.
One long blast can mean one of many things: 1) I am turning to starboard 2) In a situation of restricted view (ie turning a blind corner on a river) it's a warning signal to warn other vessels of your presence 3) In fog it is a general fog signal for vessels over usually over 12meters underway (this is repeated every 2 minutes)