In certain weather situations, they used to sound warning signals to ships (8)
I believe the answer is:
foghorns
(Another definition for foghorns that I've seen is " Warning signals".)
I've seen this clue in The Irish Times.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free.
Check out my app
or
learn more
about the Crossword Genius project.