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GPS locks and loads
By : PRASANNA RAMAN
2008/03/25
Teoh starting his GPS system to get to his destination. |
You don't have to get lost driving to unfamiliar destinations anymore. PRASANNA RAMAN speaks to two executives who swear by the Global Positioning System.
| Teoh doesn't have trouble looking for places anymore. | HOW many times have you missed a junction and had to make a U-turn to get to your destination? Or how often have you inched forward so as not to miss those little street signs to the restaurant or shoplot to which you抮e headed?
Instead of making frequent stops by the roadside to ask for directions, (and getting differing answers to further confuse you), don抰 you wish you could turn to a reliable source that would guide you correctly to your destination?
There is such a source which will not let you down: it抯 called the Global Positioning System (GPS), better known as 搉avigation |
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HOW GPS WORKS
The GPS is a system that uses satellite imaging from some 24 satellites orbiting Earth.
Developed by the United States Department of Defence, the GPS was widely used for military purposes. It was only in 1983, after the Korean Airlines Flight 007 was shot down that President Ronald Reagan issued a directive, making the system available for civilian use for free.
However, as satellite signals are precise, a random error is introduced into signals for safety reasons.
So if you have a hand-held GPS receiver, the position indicated, at any time, will usually be wrong by 100m or more.
GPS is now a widely-used navigation tool worldwide.
GPS is used in map-making, land surveying, commerce and scientific fields.
GPS use for the man-in-the-street is fast catching on in for car navigation.
Note: There抯 more than one way to have navigation maps in your hands. Hooking up your PDA or smartphone to a GPS receiver is one way.
Getting a dedicated GPS device is another option. Garmin, ProGin, Mio, GPS Tracker and homegrown brand Gophers are among such GPS devices.
Then there抯 having a handphone with a GPS system built-in. Nokia, HTC, Motorola, HP and Samsung are among the phones that offer GPS. |
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Ooooooo....barula aku paham...TQ |
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Originally posted by amazed at 1-4-2008 10:51 PM
HOW GPS WORKS
The GPS is a system that uses satellite imaging from some 24 satellites orbiting Earth.
Developed by the United States Department of Defence, the GPS was widely used for military purposes. It was only in 1983, after the Korean Airlines Flight 007 was shot down that President Ronald Reagan issued a directive, making the system available for civilian use for free.
However, as satellite signals are precise, a random error is introduced into signals for safety reasons.
So if you have a hand-held GPS receiver, the position indicated, at any time, will usually be wrong by 100m or more.
GPS is now a widely-used navigation tool worldwide.
GPS is used in map-making, land surveying, commerce and scientific fields.
GPS use for the man-in-the-street is fast catching on in for car navigation.
Note: There抯 more than one way to have navigation maps in your hands. Hooking up your PDA or smartphone to a GPS receiver is one way.
Getting a dedicated GPS device is another option. Garmin, ProGin, Mio, GPS Tracker and homegrown brand Gophers are among such GPS devices.
Then there抯 having a handphone with a GPS system built-in. Nokia, HTC, Motorola, HP and Samsung are among the phones that offer GPS.
actually, there are more than 24 GPS satellits currently orbiting the earth (this is to make sure that at least 4 satellites are above horizon at any time, at any place on the earth surface because the location fix/computation requires at least 4 satellite fix)
Accuracy of the GPS is greatly improved using Differential GPS method.. |
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