Word: buoyed
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Dates: during 1990-1999
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...active" by electronically transmitting a "ping" that would locate a target when the sound waves bounce back from it. The problem: echoes from the ping would also disclose the location of the tracker, even if the ping were generated from a third source, such as a buoy towed behind the sub or dangled in the water by a helicopter. The alternative is nonacoustic detection. For example, researchers are exploring ways of sensing a submarine's magnetic field, its thermal radiation or the turbulence in its wake. Some are even studying the bio- luminescence and the scattering of fish caused...