TomTom GO 730T 4.3-Inch Widescreen Bluetooth Portable GPS Navigator with Traffic Receiver
The basic type portable GPS receiver is around US$ 100. Usually, they offer basic features such as the United States map in details, a small color screen, voice guidance and power adapter. This basic type have enough features to assist you during driving, although you couldn’t get additional features such as voice recognition, FM traffic receiver, add custom points of interest (POI’s), JPEG picture viewer, MP3 player, world travel clock with time zones, Multi-Destination Routing, trip calculator and so on.
Unfortunately, the portable GPS navigation system doesn’t have internal compass accelerometer or a device used to measure the car’s speed. So, it can’t navigate as accurately as a build-in GPS system. It is important to buy a portable GPS receiver that has a build-in accelerometer, if you use the GPS very frequently or live in an area where there are a lot of high rises and tunnels.
The Car Sat Nav or car satellite navigation now has revolutionized. Satellite navigation devices are now fitted in almost every vehicle such as airliners, boat, taxi drivers, couriers and the family car.
Navigation like car sat nav is just one of the main uses of GPS. To make travelling comfortable and trouble free to find unfamiliar destinations, car sat nav GPS pin point locations from space.
Sat Nav or satellite navigation relies on a constellation of satellites known as GNSS (Global Navigational Satellite Systems). And the Global Positioning System (GPS) is only one fully functioning GNSS in the world today.
GPS has a constellation of more than 30 satellites. For accurate navigation, at any one time at least three or four of these satellites are overhead. The GPS satellites each have onboard an atomic clock that use the resonance of an atom (the frequency at particular energy states) which makes them highly accurate, over a million years not lose as much as a second in time. It is really unbelievable precision that makes car sat nav possible.
The satellites relay a signal from the onboard clock that consists of the time and the position of the satellite. Then, this signal is beamed back to earth where your car’s sat nav retrieves it. The computer in your GPS system will result exactly where you are on the face of the earth by calculation how long this signal took to reach the car and triangulating four of these signals. It is only required three signals on a ‘flat’ earth and four signals if the elevation changes.
GPS systems can only work as a result of the highly precise accuracy of the atomic clocks. GPS systems signals are relay at the speed of light and accuracy of even a millisecond. It could adjust the positioning calculations by 100 kilometers as light can travel nearly 100 kilometers each and every second, although currently GPS systems are accurate to about five meters.
These days, more people are becoming interested in getting GPS Navigation for their cars, because there are many advantages that GPS can bring for driving car easier. They want to learn more about GPS navigation for car details and how it really works.
GPS navigation for car works with the GPS that enabled receiver installed in your car transmits a signal to the GPS systems and is picked up by three or more satellites to give you the exact location and direction you are going to. By combining it with detailed maps and coordinates, GPS navigation car a lot more useful which you will know precisely where you are relative to your current location, so you won’t get lost even in new places.
GPS navigations systems for car allow you to select a specific destination and immediately, the GPS receiver installed in your car will direct you to the location that you will go.
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