Shallow Water Operations
Several new technologies will be needed for shallow-water naval operations. Since acoustic sensors (i.e., passive hydrophones and active sonar) perform less effectively in shallow waters than in the open seas, there is a strong pressure to develop additional sensors.
One family of techniques, which will require electro-optical sensors to detect, is bioluminescence: light generated by the movement of a vessel through plankton and other marine life. Another family, which may be solved with electro-optical methods, radar, or a combination, is detecting wakes of surface vessels, as well as effects on the water surface caused by underwater vessels and weapons.
Read more about this topic: Electro-optical MASINT
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—Jean Scott Rogers. Robert Day. Mr. Blount (Frank Pettingell)