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Spelling and grammar checker. Very useful for the sort of professional communication required of engineers.

Piezoelectric transducer interface that would serve to increase the accuracy. The most common use of piezoelectric transducers of course is in sonar (I think). Underwater acoustic communication systems have been relying on scalar sensors only, which measure the pressure of the acoustic field. Vector sensors measure the scalar and vector components of the acoustic field in a single point in space, therefore can serve as a compact multichannel receiver….hmmmm….you could study the propagation of acoustic waves through velocity channel impulses responses which are generated using pressure channel impulse responses sent out and the vector sensors receive them - but make the waves in such manner as a secret code – then convert the vector sensor data to usable data, hence a transmission has occurred and the system appears to be "just measuring data." Instead of utilizing these channels JUST to analyze the propagation characteristics of an acoustic wave under different environments – you would be using it to send/receive data. If you encrypt the data first, now you have an underwater secret transceiver that looks and acts like a measurement analysis system! Now my head hurts.