Three blasts of the horn typically signify a warning or alert, often indicating that a vessel is about to maneuver or that there is a potential hazard nearby. In maritime contexts, it can also indicate the intention to take action, such as leaving a dock or signaling to other vessels. The specific meaning can vary by context, so it's important to consider the surrounding situation.
it is the same right
Six blasts of a ship's horn does not seem to have a meaning. Five blasts will mean that you are possibly too close to another ship.
One long honk on the horn
Three short blasts tell other boaters, “I am operating astern propulsion.” For some vessels, this tells other boaters, “I am backing up.”
three short blast
gat out of my way
A warning to other boaters there is danger near by.
Get The Bleep Out Of The Way.
A boat is astern propulsion and is in the act of backing up
Three short blasts means you are operating in reverse. One prolonged blast followed by 3 short blasts means boat under tow in redcued visibility conditions.
I intend to pass you on my starboard (right) side.
Means it's about to turn to port.