You are correct Sir....my apologies... 
You are also correct Sir....though "pinging" is active sonar whereas, I was an "Acoustic Analyst" or "Acoustician"....analyzing acoustic anomalies in the deep ocean sound channel........sound physics....not a great market for that particular talent in the civilian world......DYK...
In other words seeing who ELSE was pinging

You know what the British said about that, " Gentleman do not read the mail of other gentlemen", of course they were reading "the mail of other gentle men as far back as Queen Elizabeth I.
