Hit a blunt.

You have to hear it though

Not really mate.
Modern warships using singal lamps which open and close shutters to flash a light in Morse code.
You can simply turn a light on and off in a pattern, or flash a reflective surface.
Can communicate in Morse code in many more ways than just beeping.

Ah, sorry
Ok question: If you pulled one end of a rope, how fast would the tug be? (To reach the end)

I may be wrong, but I believe it will be at the speed of sound of the material you're tugging at. So it depends.