Destroyer is a fast vessel which is has to protect the convoy from attack by submarines. It is
equipped with radar which shows the location of the merchant vessels in the convoy. It will also
detect submarines when their periscope is up. When a submarine is submerged the destroyer uses
Sonar to detect it by sending a pulse of sound waves (ping) and listening for the echo. This is the
origin of the ping term use in networking. A sonar signal will be heard as the initial ping followed by
a weaker ping of the echo when a sub is detected. When the destroyer is near the sub the echo is
stronger and the time delay is shorter.
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