Navigational system for trip routing

摘要: Method and apparatus for indicating allowing a traveler to follow chosen route from an origin point destination on the Earth's surface, using portable Satellite Positioning System audible or visual information presentation means. Initially, positions map chart with intended thereon light-sensitive table traces each segment of pressure-sensitive light pen. Information locations its endpoints is entered in microprocessor. Coded shown itself into microprocessor, bar code reader similar device. Along route, carries microprocessor (SPS) antenna receiver/processor, connected As approaches turn decision determined by common endpoint two consecutive segments, advises audibly visually that near initial direction next segment. The also advised if actual deviates significantly appropriate corrective action be taken reduce deviation. Optionally, can include one more alternative routes used portion impassible otherwise unavailable. This approach special usefulness impaired preoccupied traveler. SPS may incorporate differential positioning improve accuracy SPS-determined location.