A walk in the woods: satellites show the way in the new sport of geocaching

Article Abstract:

The Global Positioning System (GPS) consists of 24 satellites and five ground stations with the satellites transmitting low-power radio signals on frequencies in the UHF band. The handheld GPS unit triangulates its position anywhere on the planet with the new ones being introduced with built-in maps and screens that work much like a web page.

Guided missiles and space vehicles, Artificial satellites, Satellites (Spacecraft), Geocaching

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Crowded Skies

Article Abstract:

The article describes and examines free flight, a proposed solution to air travel congestion that complicates air traffic control. It involves allowing pilots discretion on choosing flight paths to maximize the advantage of tailwinds, and would necessitate the use of global positioning system displays and transponders.

Facilities & equipment, Airports, flying fields, & services, Air Traffic Control, Methods, Equipment and supplies, Navigation (Aeronautics), Air navigation

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Retooling the Global Positioning System

Article Abstract:

The Global Positioning System (GPS) would ensure greater reliability and safety and would also provide much more geolocation services during the next decade. The Global Positioning System serves more than 30 million users.

United States, Services information, Services

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