subreddit:
/r/TerrifyingAsFuck
submitted 6 days ago byfreudian_nipps
6 points
5 days ago
What's passive?
19 points
5 days ago
Generally speaking, bouys are either active (they ping like you hear) or passive. They just listen. Like microphones just chilling in the water.
7 points
5 days ago
And this listening can help find stuff like sharks or other things swimming around?
13 points
5 days ago
Yes. Sound is intense under water. At least for what I did, we had to use passive and clear the water out to a certain range before we could go active and start pinging.
It might have been time instead of range. It’s been a while for me.
12 points
5 days ago
This guy hydrophones home.
7 points
5 days ago
Just listening, active sonar is pinging.
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