OK, let's analyze the situation. It works the same way for radar.
Remember the last time you were being pinged by an escort? What did it tell you? It told you there was an escort out there. Hearing the ping get louder or softer told you whether the escort was approaching or receding.
That's what they know about you when you ping.
What do you know when you ping twice? You know their exact position, and their course and speed! Advantage you.
Same thing with radar. They know you're out there somewhere. You know where they are, and their course and speed. Advantage you.
If they already know you're out there you lose nothing with active sonar or radar. If they don't know you're out there you already have such an advantage that you should consider carefully before losing it.
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