Abstract: An improved microprocessor-based navigational aid system for use onboard a vessel is disclosed. The system includes a microprocessor having peripheral memory devices, sensors for measuring variable parameters and thumb switches for inserting known values for fixed parameters. The microprocessor computes from these parameters, data which enable the optimum navigation of a vessel. In determining these data, the computation includes such factors as leeway and current set and drift, which are determined electronically. The system includes components for receiving information regarding the vessel's present position from a satellite-based external information source. That information is relayed to the microprocessor which uses it to periodically correct the positional information stored in the peripheral memory device.

Abstract: A navigational aid system including a microprocessor having peripheral memory devices and being programmed by a read only memory, the system including sensors for measuring variable parameters and thumb switches for inserting known fixed data, and the microprocessor computing from such parameters and data readout data needed for optimum navigation taking into account such factors as leeway and current set and drift, the system having switches to select which data is displayed as the switches are sequentially polled, and the displayed data being accompanied by alpha indicia uniquely identifying each displayed numeric value.

Abstract: A vibratory pest control device having a sonic resonator with more than one mode of vibration and a driving element coupled to the resonator to vibrate it alternately at different frequencies.