Well Hipshot, I guess you have an ultrasonic device in a cabine (external device) for mice pleasure - I guess it may interfere more with a dog hearing system (so I guess you dont have a dog onboard). Actually this ultrasonic anti-fouling device its embedded in the hull, and the transducer emits ultrasonic vibrations (ultrasound) throughout the hull, and theoretically inhibiting the biofilm formation (?!?) and macrocolonization.