I'm going to try to force him to run under you with active sonar.

The surface force alone, active sonar or not, is never going to get us.

And that since we're on the bottom, active sonar won't be much good either.

"Do you have the range to the Chinese active sonars yet?"

Active sonar used too soon might hurt us more than it helps.

It doesn't give away the hunter's presence as an active sonar would.

But then, active sonar would be used only if Cheyenne's presence were otherwise known.

"Has there been any use of active sonar whatsoever from your contact to port?"

He knew that using his active sonar would give away Cheyenne's exact position.

"I want you to ping the other boat with active sonar."