Abstract: A navigational aid and autopilot in which informational data pertaining to the physical operating conditions of the craft, the external characteristics relevant to the operation of the craft, and a chart mapping a selected portion of the surface of the earth in which the craft is operating are combined into a single communication correlating such data in a manner assisting an operator of the craft in the performance of his duties. The navigational aid measures external physical conditions such as radio transmissions, radar soundings, sonar soundings, and the like, as well as the physical state of the craft such as fuel flow, list of the craft, and speed of the motor. By monitoring these characteristics in association with an electronic chart, the system correlates and combines the total informational content in a comprehensive form so as to relieve the operator pilot of the necessity of integrating and correlating data from a plurality of different sources.

Abstract: A Loran C receiver is disclosed which has a scanned type keyboard including data entry, primary function and special function keys. The primary function keys include an automatic key for selecting automatic operation. A microprocessor is controlled by the keyboard, a timing means, a real time interrupt, a counter, a groundwave phase and envelope sample strobe generator, a delayed phase channel sample strobe generator and a latches and multiplexer. The timing means orients the microprocessor as to time and triggers the counter. The counter provides the proper count to the groundwave phase and envelope strobe generator and delayed phase channel sample strobe generator for producing a plurality of sampling signals for the latches and multiplexer. The real time interrupt produces a data ready or cycle done signal for the microprocessor.