Hence, GPS is now the latest technological innovation used of air navigation and manufacturer now. The cost of the satellite system is assumed to be high. Air Navigation Pro is a flight planning and real-time aircraft navigation app for private and professional pilots all over the world. GPS unit calculates latitude, longitude and also altitude. It will be assumed that the navaid covers all the Earth's surface of interest, down to ground level. For military users holding the key to a more sophisticated mode of operation, a significantly greater accuracy is available. It quickly and reliably acquires GPS and GLONASS satellite constellations which it combines with advanced navigation tools on interactive aviation maps. The GPS also determines velocity, and data can be updated every second or so. For military users holding the key to a more sophisticated mode of operation, a significantly greater accuracy is available. 65 AUGMENTING GPS FOR AIRCRAFT NAVIGATION AND APPROACH GUIDANCE Paul R. For civil users, confined to the ‘coarse acquisition’ mode, there is a 95 per cent probability that the horizontal position error will not exceed about 20 metres. The Global Positioning System is a constellation of orbiting satellites that provides navigation data to military and civilian users all over the world. An attempt will be made to discuss, from first principles, the consequences to both civil and friendly military users of the availability of a global, satellite-based navaid that makes possible the determination of position in three dimensions to a high accuracy. It must be stated at the outset that the present author has a technical knowledge of Navstar GPS based only on fragments of the literature open to the public, and no knowledge whatever about the plans for its military use.
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