Boats (people) can communicate silently with flags or light signals.
when you want to kill silently
"Silently" is an adverb and it almost always modifies a verb. "He tiptoed silently into the room." "She didn't speak, but her eyes silently followed him as he entered."
Some cats meow silently because they have learned to communicate without making noise, using body language and other subtle cues to express themselves.
When a cat meows silently, it typically means they are trying to communicate with you without making any noise. This behavior is often a sign of affection or a way for the cat to get your attention without being loud.
They have radios stationed in all boats. <><><> Well, there are radios in MOST ships, and many boats. Besides radio, ships communicate with each other by horn signals. There is a standard set of signals that indicate actions that a ship is about to take.
The Biped stood there silently.
Do boats use sonar. Yes they do.
The telegraph was installed on boats so they could communicate with the headquaters.
The gutsy soldier just silently grimaced.
Silently is the correct spelling.
Silently is an adverb. Many adverbs end in the prefix -LY.
Dolphins use echolocation to communicate with each other. Bats use it so they dont fly into things like trees. Boats and submarines use it to locate where each other are so they can fire bombs at one another.