3 short blasts
loud
one prolonged blast
one prolonged blast
one prolonged blast
Keeping his/her vessel and crew out of danger
its easy sound signal
An anchor ball is a sphere attached to the vessel of an anchor buoy, used as a signal to state that the vessel is anchored.
The Blue Peter is flown
The signal for a fire on boards is a long blast on the ship's whistle along with sounding of the vessel's general alarm.
endanger others or damage their property
The sound signal short-long-short is an optional, additional signal made by a vessel at anchor in restricted visibility. The signal may be made by such a vessel in addition to her required sound signal to give warning of her position and of the possibility of collision to an approaching vessel.Collision Regulations 35(g)
Assuming you are referring to a fog horn or a warning signal, generally find where the other vessel is and change course accordingly