Nautical rescue apparatus and instruments namely, active sonar; research apparatus and instruments namely, towed array sonar; navigation apparatus and instruments namely, cylindrical array sonar, acoustic intercept array sonar, passive ranging sonar; downloadable navigation software; sonars; ultrasonic transducers; ultrasonic sensors; underwater sonar navigational apparatus namely, active sonar; underwater acoustic detecting apparatus namely, transducers, hydrophones, cylindrical array sonar, acoustic intercept array sonar, passive ranging sonar, mine avoidance sonar, towed array sonar, flank array sensors, own ship noise measurement equipment; underwater sound analyzing apparatus namely, sonar processors; underwater sound classifying apparatus namely, sonar processors; underwater sonar imaging apparatus namely, sonar processors; underwater sonar surveying apparatus namely, cylindrical array sonar, acoustic intercept array sonar, passive ranging sonar, flank array sensor, and control and display units therefor
