9 [ Measuring apparatus and instruments, namely, transducers, thermocouples, pressure sensors; Electrical signaling apparatus, namely, transmitters of electronic signals, electrical interconnect cables, and electrical connectors; Signaling apparatus and instruments, namely, electric warning lights and indicator lights; Checking and supervision apparatus and instruments, namely, transducers and instrument panel meters, namely, electronic instruments that display input signals in either a digital or analog form; Measuring, signaling, and checking apparatus and instruments, namely, GPS navigation devices, navigation apparatus for boats, directional compasses, speedometers, depth gauges, ammeters, voltmeters, ohmmeters, pressure gauges, thermometers, tachometers, tachometers for showing synchronization of multiple marine propeller speeds; Measuring, signaling, and checking apparatus and instruments for marine vehicles for measuring and displaying temperature, distance traveled, acceleration, engine speed, vehicle speed, torque, yaw rate, pressure, liquid level, height, power, position, rudder angle, path, engine hours, wind speed, wind direction, and water depth ]