| Finding the way home  | | | |  Hundreds of years ago, travellers found their way by looking at the stars. They built towers that could be seen from far, made maps and invented the compass.
Nowadays, almost every explorer and mountain climber uses the Global Positioning System (GPS) to make their journeys safer. There are even plans to put GPS receivers on all the taxis in Beijing in time for the 2008 Olympics. Finding your way has never been so easy.
Technology has changed our lives: for less than 500 yuan, you can get a pocket-sized GPS gadget that will tell you exactly where you are on Earth at any moment.
When people talk about a GPS, they usually mean a GPS receiver. The GPS is actually a set of 27 Earth-orbiting satellites-24 in operation and three extras in case one fails.
The US army developed this satellite network as a military navigation system in the 1970s, but opened it up to business use in the 1990s.
A GPS receiver locates these satellites, records the distance to each, and uses the information to calculate the receiver’s exact position on Earth.
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sahyd2don
(2422) | | How often do you use it.How helpful do you find it. | | | 
PearlGrace
(1880) | | Ours is a Garmin nuvi and I love it! I can't get over how great this Global Positioning System... | | | 
chintoo07
(3199) | | Hello EverybodyJi,
A company under title ‘Micro-technology’ has come out with a product ‘Buddy... | | | 
staykool
(16) | | I was setting in my big leather recliner the other day and I heard an interesting dispute between a... | | | 
daya_sound
(340) | | Can anyone say how Global Positioning System helps in tracking out the vehicle or cell phone? i... | | | | | | | | | | |
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