Receivers or satellites? The US has over 22 GPS satellites in orbit. The Russians have their system, the EU is getting ready to launch a system, too. Don't know about the Chinese.
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A GPS satellite. GPS stands for Global Positioning System. The NAVSTARS orbit earth, and emit microwave signals that are received by GPS receivers, which electronically translate the output from the satellites into realtime global position and precision time of day data. There is no example of a GPS satellite, other than a GPS satellite. The United States Government Department of Defense operates the Global Positioning System. It is available for use by citizens of any nation. It is provided free of charge, as a public service to the world. The United States Government is the number one largest contributor of funds, free services and open data meant to make the world a better place. The United States is the largest global contributor to advanced technology, humanitarian international law, peace, justice and truth. The global positioning system is only one example of the incalculable good done by United State's institutions and government.
Given the technology back then, I would say that maps were not as accurate as they are today but,were still an extremely useful tool.Maps today are used by many different people in many different lines of work. Example of someone who would use a map include:Delivery drivers, service personnel, aviation pilots, naval captains, locomotive operators, etc.Due to our ever increasing technology, map usage is declining due to Global Positioning Systems (GPS
Earth Hour raises awareness of global issues, particularly in regard to our overuse of non-renewable resources, and resultant light and air pollution. In 2009, the third year of Earth Hour, WWF urged people around the world to VOTE EARTH and reach the target of 1 billion votes by the time world leaders for the Global Climate Change Conference in Copenhagen, Denmark, in December 2009. At this meeting, government policies to take action against global warming were to be decided. People around the world were able to cast their vote at the official Earth Hour website (see link below).Throughout maintaining peopel's awareness of global warming issues, people are also encouraged to make their voice heard, and to make any small contribution they can, even if it means just turning of appliances for awhile.
1. They help speed communication around the world. 2. They can get out past the atmosphere so that astronomers can get a better look at the stars, etc. 3. TV signals 4. Navigation systems.
global warming. well, now that i mention it, it is pretty much whats threatening the whole world.