When a transmitter range gates, it sends out a new ping as soon as it recieves the return of the preceeding one, so if a contact is range gating as it pings you, you can count the time between pings and work out the range. If you simply detects someone's ping, all you really get is a bearing.
There's supposed to be a voice cue for active sonar. Not sure why it isn't hooked up.
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