Understand How GPS Works

Global Positioning System (GPS) is a navigational aid originally developed for the military. The system simply receives signals. It is the applied technology that gives the GPS its versatility.
If you have ever used map and compass, you will understand a little about how the GPS
works. In order to find your position on a map, you need to have three points of
reference. The intersecting line from the reference points is where you are. Map and
compass work uses triangulation (bearings), GPS uses trilateration (distances) to calculate location. Satellites orbiting the earth emit unique signals that can be received by a GPS. The GPS software interprets the signal, identifying the satellite that it came from, where it was located, and the time that it took for the signal to reach the system. Once the receiver has both time and distance it begins to determine position.
Three satellites provide the intersection point and the fourth is used to check that the positioning is accurate. Accuracy depends upon the synchronization of atomic clocks in the satellites with the clock in the GPS system. Although the clock in the GPS is not atomic, utilizing the fourth satellite gives it that functionality as the internal clock adjusts itself to correct any discrepancy discovered.
GPS has gone far beyond its initial military application. Drivers can find their way
through city streets, long distance trekkers use the technology to cross unfamiliar terrain, mariners and pilots use GPS enhanced data to cross the seas and skies.
In–vehicle GPS can be integrated into the car entertainment system or can be installed as a removable device. These systems need to tell the driver where he/she is and how to
reach their destination. The information includes road directions plus relevant features along the way such as rest stops, gas stations, points of interest, etc. Auto GPS uses voice commands so that the driver can concentrate on the road.
Hikers and trekkers use similar technology, but normally without the inclusion of road
systems on their devices. Mapping software defines the territory that the hiker will
encounter. The user can enter waypoints (points of reference) so they can return using the same route. They can add points of interest such as water sources, possible campsites, and other items of interest on their trail. However, the portability demanded by hikers will also limit the functionality of the system as small screens mean that some detail will be lost.
It is GPS technology that is used to track individuals on home arrest, to trace missing
pets, stolen vehicles, and missing people. Small systems can be incorporated into pet
collars and wristwatches. As long as the receiver is active, it can be found.
Marine and aviation GPS units are sophisticated and specialized. The principles involved are the same as any standard system; the software is much more highly developed.
Any fisherman, who is using a fish finder on his boat, is using a GPS that is enhanced by
sonar and tracking devices. Units have been developed for use on float tubes also -– as
GPS technology advances, the systems become more and more compact and their uses
more and more extensive.
If you are considering purchasing a GPS, make sure that it can be updated easily. This is especially true if you buy a multi–function GPS or one that is used where conditions change regularly. An in–vehicle GPS soon loses its usefulness if it is not updated as road systems change.
Updates vary according to the device being used. They can come in CD/DVD packages
or as computer downloads. The user can purchase maps specific to the area in which the GPS will be used or a range of maps and routes. These are available from GPS software companies who will charge proportionally to the sophistication of the software.

GPS units vary in price according to their usefulness. It is possible to buy units for less than one hundred dollars to units costing more than one thousand dollars. What your needs are will be a factor in the cost of your unit. If you are a backpacker then portability is a major consideration. If you are a trucker, you need to be able to find a delivery point as quickly and conveniently as possible. Whatever device you go for, cost is generally related to quality. Buy the best you can afford.



Understand How GPS Works

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How to buy a good truck or a car found at the Internet site?

The Net is constantly growing and its users develop more and more applications and utilize it in completely new ways. Several years ago a couple of new sites showed up in the Net; these sites were dedicated to the sale of automotive vehicles. Since that time the number of these sites has substantially increased and I have participated in building search engine for used truck sale -European www.truck1st.com , American www.truck1st.us and Russian www.truck1st.ru. Basing on my experience in Internet used truck sales, I can offer you several recommendations on buying trucks and cars; I hope you’ll find them very useful.
The main goal of this kind of sites is to connect sellers and buyers of automotive vehicles, both new and used. Using such sites makes vehicle trade much easier for sellers as well as for buyers. These sites create virtual marketplace where buyers can offer their vehicles and sellers can look through the buyersÂ’ stock. So the search for the customer or for specific vehicle becomes unnecessary, saving lots of time and money for both parties.
In practice it looks as follows. The seller places his vehicles at the website, usually it is vehicle description, pictures and additional info (price, delivery terms and contacts). See www.truck1st.com for specific examples. So when the buyer wants to buy a vehicle, he gets online, connects to the website and looks through the sellersÂ’ vehicles. Then he gets in touch with the seller, confirms vehicle specification and availability and purchases the vehicles. Such internet trade allows to shop for vehicles located not only your vicinity, but nationwide and even worldwide. Sometimes it saves a lot of money and lets find exactly what you are looking for.
It is clear that the used car or truck technical condition is a crucial factor. When choosing used truck or car, the more choice you have – the better the chances that you will buy a vehicle in good technical condition. In this case Internet purchase is a very effective solution.
So letÂ’s contact the seller and clear everything up. It is better done by phone, though email message is also acceptable. But you will save a lot of time by making simple phone call. Besides, the human factor in communication is very important, so pick up the phone and call him.
What should I mention during my first contact with the seller? Here is a list. But very important – write down everything the seller will say to you. Later, when you think everything over to make decision, you will appreciate it later.
So letÂ’s contact the seller and clear everything up. It is better done by phone, though email message is also acceptable. But you will save a lot of time by making simple phone call. Besides, the human factor in communication is very important, so pick up the phone and call him.
What should I mention during my first contact with the seller? Important – write down everything the seller will say to you. Later, when you think everything over to make decision, you will appreciate it.
1. First of all represent yourself, name the reason of your call and website where you have found the truck. Ask if the vehicle is still available.
2. LetÂ’s assume it is not sold yet. Then ask about every word in the description to check it is really true. It is much better if you spend 2 minutes of your time now, than to come to the buyer after and find out that there is no air conditioning, though it was mentioned at the website.
3. Ask about everything that was not described – minor technical problems, condition of engine, body, clutch, suspension, tyres, interior. Do not forget anything, you should have complete picture in your mind. For example, the cost of new tyres for tractor truck is about 200$ for a wheel and a lot of people usually forget to ask about tyre condition.
4. When it comes to price, do not be shy to argue a bit. Usually people put a little higher price that would actually satisfy them. Anyway a little of bargaining never harmed anyone.
It is much better for if you choose several vehicles and make several calls. You should not restrict yourself to a single truck, remember – the more choice you have, the better truck you will buy.
So by this time you should have called 3-4 sellers and have 3-4 papers with complete description at your table. Now its your time – relax and think everything over and make your final decision. Sometimes it is wise to call the sellers again and tell them that you have a little better offers – it will surprisingly move the prices down and help you make your final decision.
That’s it, now you are ready to go and pick up your new used truck. Just don’t forget to let your eyes see everything your ears heard – take the paper with vehicle description (that you have written down during your talk with the seller) and check everything. It is very advisable that you check the truck or car at the local service center – let professionals do their job.
And by the way, the last price is always fixed after final vehicle examination.

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How to buy a good truck or a car found at the Internet site?

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