why you should get a gPS
We all get lost from time to time. It happens. 
It happens to some of us more than not. However, getting lost can add a lot of stress to any journey. You don’t want to get lost in a new city. Or for that matter you don’t want it to take forever to get from any point A to point B simply because you took a wrong turn or wrote down the directions wrong. Some people do not read maps well, and it is dangerous for anyone to read maps while they are driving. Some people do not keep maps in the car, and some people simply hate asking for directions.
So what do you do about this situation? Simply stop going anywhere new? Should we simply stop exploring and traveling? This is not really an option for most of us, and all of us would miss so much if we chose to live our lives this way.
Fortunately there is a solution that doesn’t involve you becoming a hermit. In fact, it will let you go explore more places with a higher confidence level then you thought. You never need to miss a plane, show, or reservation again simply because you were late or couldn’t find it altogether.
In today’s world, the convenience of maps with the helpful nature of a navigator can be obtained by simply purchasing a GPS system. This handy little gadget contains maps of wherever you need to go, and will literally tell you turn by turn how to get to your destination. This way you can go wherever you want, whenever you want and you can go by yourself if you want or need to. You will simply click it onto your dash, tell it where you are, tell it where you need to go and there you go. You have a clear and straight path laid at your fingertips.
You should make sure to get a high enough quality GPS that it will be reliable whenever you need it. You also should be aware that GPS systems need to be updated every so often. This will occur more often when you live in a city. They come with a certain maps. When new streets or other construction is added, the old maps will not take them into account. However, this problem is easily avoidable by simply purchasing an upgraded set of maps. GPS systems also come in a range of prices to accommodate a wider spectrum of budgets. Now we can all enjoy our travel more with the piece of mind that we know where we are and where we are going.
How A GPS Works
The GPS, or Global Positioning System (global position monitoring), presented to the world by the U.S. in 1991, currently consists of 31 satellites orbiting the Earth at an altitude of about 18-20m/km. They constantly send signals over the entire surface land, these signals, in the form of simplistic "beep" radio, are received with simple antennas which are in a unique position. They use the signals from different geographic positions of these satellites to triangulate GPS’s position.
An electronic device type GPS receiver, without any positioning information, until then, begins to receive signals from satellites in space, of the 31 satellites, a high percentage are hidden from the planetary positions and the position of the axis, compared to meridians and parallels, where the satellites are divided into groups of four on each of six orbital planes. The device remains in constant contact with the satellites and from there are sufficient only those of triangulation, ie, 3 satellites (4 for height), to maintain the constant signal, this phase is called ALIGNMENT.
Phones and PDAs, which often use custom chipsets in general have a built-in GPS along with many other systems, and sometimes, the receiving antenna is unified. The particular design of smart phones and handhelds, often makes them the best reception GPS. As a result we now have A-GPS. A-GPS is a system that improves and enhances the reception of GPS, relying on network data and voice network to obtain additional information on placement, to be added to those arriving from satellites in space, purpose of obtaining an alignment faster and maintain a strong signal route.
Generally, the GPS needs 8 / 9 visible satellites to determine an efficient alignment of the first starting position, following 3 satellites are enough to keep the signal, or 4 to also have the relative height. A-GPS needs fewer and can find the signal faster. This position obtained is compared in real time with mapping software, so you can determine with high precision (say, at present, about 10 meters), their position on a city map, national or worldwide. This system is called POSITION.
Once you have your position, always with the help of specific software, you can get a calculation of an optimal path, from an area of the map to another, and subsequently receive instructions on how to route efficiently, this system is NAVIGATION said.
A new path is re-processed in near real time, this system is said recalculation.