Best Car Radio Upgrade with big save

Classic car radio upgrade or smart car radio upgrade is becoming more and more popular among all of car accessories remove.You may want to know that why should I replace the original car’s radio system with the newest car DVD player.If you have viewed some details about aftermarket car DVD,you will not have these questions.How to find the best Car Radio Upgrade with big save?Comparing with several sellers and you will find the differences among all of them.Be careful!The cheapest head unit may not be the best and the most expensive one will not just be the best.You had better open your eyes to read the product instructions.Just like most of the electronic products,you should know about the information such as operation system,screen size,CPU,memory or hard disc  capacitance and functions they showed on the website etc.At the same time,after-sale service is a reference we can’t ignore at all.Especially to this car nav machine,we need have the professional install it.Its importance is obvious for your choice.In fact,for buying a car DVD audio system,placing the order is just half of your buying process.So keeping in touch with the customer service before installing it is a smart act for you.So if you find a good seller,they will keep in touch with you every now and then.But if not,I’m so sorry that you are not lucky in this shopping experience.The good luck is from your smart choice for merchant.

radio function for the best car radio stereo replacement head unit
radio function for the best car radio stereo replacement head unit

An outstanding function for this car DVD GPS navigation system is the external DVR function.A part of the information about it is shown below:

DVR function of the best Car Radio Upgrade sat navi system
DVR function of the best Car Radio Upgrade sat navi system

Other functions like radio,bluetooth,navigation,video,audio and so on will be shown in the video.You just need click it lightly to have a full experience to its multi-function.

After watching the video above,I believe that you have had  general understanding to it.Just imaging that you were driving on the wide road and the music from the car DVD player or your iphone through car radio audio system is flowing to your ears.navigation is going on together with the music or radio.3-zone POP function satisfying all of your needs.How cool it is!When parking your car in somewhere to have a rest,video is the best way to enjoy your relax time.Then the big 4GB hard disc capacitance solve your problem of forgetting taking a DVD disc.Through what function?Yes,you can download from CD/DVD to the head device!They built-in 20 disk virtual CD changer!What a surprise,isn’t it?If you have found the best car DVD player,it must be in seicane.Contacting with the customer service by email,telephone or chatting online will be a good idea.

Android head unit is the trend of Car DVD Player GPS Navigation system

Android is a word which is well known by most of people around the world.Our cellphones are the best products connected with android.While our step will not stop at all.The car DVD navigation is another great product related with the android.If you have a car and have installed a car DVD player with wince system  in the dashboard,I think,you can upgrade it with a car radio navigation with android system under the premise of your need.Anyway,android head unit is the trend of Car DVD Player GPS Navigation system.We have to say that it is also a fashion which is worth us to catch up with.Just like the mobile phone,we will line up just for an iphone 6 or 6 plus which the length can be enough to circle around the earth.There will be 3G and WiFi dongles in the package and you can use network through the two dongles if you have bought a android car nav machine.At present,there aren’t too many service centers all around the world.Because just Asia countries are producing the car DVD player.However,almost all of the countries in the world are using the car DVD sat navi machines.We all have the demands.

Android Mercedes Benz Car DVD Player
Android Mercedes Benz Car DVD Player

The touch screen,the High Speed Dual-Core processor or the Android 4.0 operation system will make you have a pleased driving journey.It’s so cool that you can take your passengers to anywhere you want to.

The back of Android car DVD player head unit
The back of Android car DVD player head unit

Maybe a video introducing the functions of the android car radio will make you fall in love with it:

We will never stop in the science field.What I showed in the picture and the video is not the latest version.We have Android 4.2 operate system to meet with your need.It is more multifunctional and  practical than this one.Certainly,it will be more convenient for you.Such as the DVR function,the file management,the DVD recording function,the 20 disk virtual CD changer function and so on.In addition,the car DVD player is designed more humanized in the newest production.It can auto detect car light to clarify day/night and On/off for button light & screen lightness automatically.If you are interested in what I said above,you can contact with us at any time you feel good.Our customer services will solve all of your questions with high enthusiasm.

How to Upgrade Car DVD GPS Navigation Map

We can say that the GPS navigation system is the most important function in the car DVD player.As a entertainment equipment,the car dvd is not just a partner for enjoyment.It is a guide for driving more.As we all know,the Sat Navi need the GPS map as a supporter.Or it is no longer of any use.The real-time information is necessary for a GPS map.So we should upgrade the map in time to avoid unnecessary mistake while driving.But how to Upgrade Car DVD GPS Navigation Map?Maybe there are many owners still don’t know how to operate it.In fact,there is a quicker method to master the update steps.You just need contact with the seller who provide you the car GPS navigation.They will tell you that if the version is the newest at present.If there is update information,usually they will help you upgrade your map freely.This is a service for customers.And it is just one of the after-sales Services.For example,if you meet some problems on installation,you can ask them for help.They also can provide advice and technology support freely.

one dashboard photo after installing the car dvd player
one dashboard photo after installing the car dvd player

The function it shows is the Bluetooth music.You can listen to the music through the cellphone Bluetooth connected with the head unit.You can try to confirm that whether your car fit this machine perfectly through the dashboard photo.If the shape and size is compatible with your original car’s CD or DVD,you can take it back without any question.

The car radio function about this car dvd player
The car radio function about this car dvd player

The car radio function about this DVD player.Most of the car DVD player is special for cars.So the effect after installation is quite great.The video will help you know more about this machine:

The first step you should do when want to upgrade your car DVD GPS map is that you need contact with the business you bought the head unit from.Once there is update information,they will provide the website link for you right now.When you open the link,you will find the download port.You can download the newest version of GPS map.However,the data of the map is so big that you had better choose one download tool to complete this work.We must remind you that you have to back the original files up before upgrading your navigation map.After upgrading,you had better try it before deleting the original data files.Upgrading car DVD GPS navigation map is really a simple thing comparing with the installation.Certainly,if you have any problem about installation or upgrading,you can click the link above to contact with the customer service.No matter whether you want to buy one car radio navigation or not,they will solve your problems as soon as possible.

Shopping Tips for Car DVD Player GPS Sat Navi

The popularity of the car makes the applications of the car DVD GPS navigation popular.While there are thousands of car nav brands in the market.How to choose one good and right car DVD player with GPS?It needs some skills.We will provide some shopping Tips for Car DVD Player GPS Sat Navi in this article.Certainly,it is just a little part of purchasing experience.We hope there will be some help for you.And you will take one that you are very pleased with.You can match it to your car perfectly.To know more shopping tips,you can click the link below.In fact,unlike other electronic production,the car DVD player is a little special and complex.Because it is a powerful machine and you need install it after buying it.Once you installed it in your car,you will not be able to leave it any more.You will think that why I didn’t get it earlier.The beautiful appearance will make your car vibrantly.When choosing this head unit,“judging people with their appearance”is the truth.You may be curious about what I said.Then follow me and I will tell you the answer in detail.

the beautiful appearance after installing the car DVD player
the beautiful appearance after installing the car DVD player

Another style of car DVD player GPS navigation system.

Another style of car DVD player GPS navigation system
Another style of car DVD player GPS navigation system

When choosing one DVD player Sat Navi,appearance is just the direct response for performance and quality.From the smoothness to the sensitive reaction and the size of the digital touch screen,they are all very important parameters you should refer to.There is one video about how to use these functions.You can experience the convenient and intelligentized operation through the function show.

Some car navigation screen may be designed too small or the sensitivity is very low.These will influence the customers’use mood seriously.In the course of using,the screen will reflect the whole performance directly.Because all of the functions must be applied through the screen such as the car radio,Bluetooth,rearview,video and so on.The battery durability of car DVD player can also fully measure the energy efficiency and overall performance.So you must pay special attention to it when choosing the machine.There are some little details like the standby function.It will increase battery durability.At present,most of the car DVD players have use the digital touch screen.It makes the user experience very cool.The bigger screen size let customers possess a happy video enjoyment.In general,there are 8.0 inch,7 inch and 6.5 inch screen to choose.Some even have 9.5 inch super screen.Having said so many tips about purchasing one car DVD player,the most important is that you must choose one which can fit your car perfectly.Most of the head units are special for some car model.So no matter how cool the car DVD with GPS is,you must compare with your car dashboard size and shape carefully.If it is not matched with your car,giving up right now.Leave more time to search for the better DVD Player Sat Navi.

Broad application prospects of Car DVD GPS navigation

car is a  transport which is the closest friend to every person in modern civilized society.Just several developing countries have possessed thousands of cars.Therefore,car nav will become one of the largest potential market in the global satellite positioning system applications in the next twenty years.The broad application prospects of Car DVD GPS navigation will attract more and more people to join in the production and sales of car DVD player.If you have insight into this initiative or you have installed one in your vehicle,you are very cool in car market.In fact,the features of entertainment and GPS location make the car DVD with GPS and radio not only apply to ordinary cars.It is also applied to the special vehicles.Such as the emergency ambulance,firetruck,welcome vehicles and so on.You should have a general understanding of the machine.

The effect photo after installing car DVD player
The effect photo after installing car DVD player

We should believe that it will bring much convenience for your driving life.The functions for this head unit are so powerful.

The single unit of car DVD with GPS
The single unit of car DVD with GPS

With the development of science technology,the real-time positioning capability and positioning accuracy are improving rapidly.In the feature,car DVD Sat navi will bring a world which can make yourself in the right position without even going there by yourself.There is a video about the DVD player functions.It will make you know the mainly functions of this head unit.

Owners must know that the car radio function is the most basic and most commonly used functions.Persons who have their own cars will use it to ease of boring driving.While the bus for example,will turn on it to receive the traffic information or make the passengers enjoy the happy journey.There is one function that the original car’s CD has never possessed.It’s the digital touch screen.Car DVD has a big screen.Having this touch screen,we can use it to do much more things.And it will make the use very convenient.The radio,Bluetooth,Ipod,GPS,video functions and so on will make you have a different experience for driving.The broad application prospects are based on the use of a large number of cars.We should have the long-term vision to find the attractive market.Then joining it to become the pioneer of car nav market.It will drive the development of associated communications technology,information technology,control technology,multimedia technology and computer application technology while developing a vehicle navigation applications.

Car DVD for BMW E90

At present, car DVD players can be roughly divided into in dash DVD player, headrest car DVD player and flip down player and other units.If you are interested in car DVD players, including various 7 inch car DVD players, you can surf the Internet to find some information.The only problem you have to worry about is what features (including screen size, media playback, radio, TV reception, etc) you are looking for.If you are planning to purchase a 7 inch Car DVD for BMW E90, pls look at this wonderful car dvd player we suggest to you.

Fit to these cars:
manual air-conditioner+heated seat
BMW E90 3 Series (2005 Onwards) Saloon
BMW E91 3 Series (2005 Onwards) Touring
BMW E92 3 Series (2005 Onwards) Coupe
BMW E93 3 Series (2005 Onwards) Cabriolet

Quick Overview

Fit to: manual air-conditioner+heated seat BMW E90 3 Series (2005 Onwards) Saloon
GPS yes Radio yes Digital TV opt.
DVD yes Bluetooth yes Camera opt.
Analogue TV yes Ipod yes Wi-Fi no
USB/SD yes Rearview yes 3G Net no

Car DVD for BMW E90 has the built-in GPS navigation system.An exit guide indicates what restaurants, gas stations, and major services are at upcoming exits. It can be a great help if you have an urgent need, or just a hankering for a certain cuisine. All navigators can search a points-of-interest (POI) database by name or browse by category, but that is not the most efficient way to find a place to eat when traveling at highway speeds. Many units allow you to search POIs along route, but the results typically are provided based on distance, which can be ahead, behind, or to the side. Even if you can search along the route, the device may think a few miles to the side is a better choice than driving another 10 minutes for the same franchise right off the highway.

Usually, LCD screen with 16:9 large screen ratio effective matrix is used in the majority of the car
DVD players.It is 6.2 inch 16:9 800*480 digital high definition TFT LCD touch screen.Disc Play.Compatible with DVD-R/DVD-RW/DVD+R/DVD+RW/CR-R/CD-RW/CD-DA/MP3/WMA/HDCD/SVCD/VCD/MPEG/JPEG etc.mini USB and SD card.Support DIVX/MPEG/DAT/MOV/VCD/XVID/MP3/MP4/WMA/JPEG etc.AUX In Support.IPOD Support.Built in analog TV. Built in DVB-T as options .AV input and output, support rear camera input,automatically switch to rear camera when revese the car.

This Car DVD for BMW E90 also have many other useful functions.Radio function.30 preset stations,5BAND*6.Support RDS.Build in Bluetooth for hand free (Coming Tel No. display function & Call out directly by touch screen).Build in Bluetooth music,play music in your phone via bluetooth, Support A2DP.Adjustable parameters can be memorized automatically, and resume back to the default.Night Mode support.Close display and enjoy music in the background,protect you for driving at night.Dual zone function support.Enjoy music while using GPS.

And the most important is Original Canbus system for steering wheel control.There are some cars which do not have the can bus, such as Hyundai, Kia, Nissan and Toyota, and some cars of VW, Honda, and some others. These kinds of cars are easy to install a 2 din universal car DVD gps player for most of these cars. They are easy to make the steering wheel control to work.For the cars with can bus, you need to be careful about it.All of these need the can bus to make the steering wheel control work. For these cars, you need to install the car DVD player with can bus, if you need to use the steering wheel control. There are many special designed car DVD gps for the car, especially for the car with can bus. You do not need to set up the steering wheel control for these cars, since the can bus is specialized for the car.

Online shopping is very popular these days, so that you can use the Internet to help, you can get help. You can search the internet for some BMW forum, as you can to help the new bees. You are an experienced user can use to find a lot of Vehicle scanner tool , beauty, and BMW. You can ask for their latest accessory, you can get your car. Use of a car-related accessories, you can find comments from other BMW owners. You can find the website where you can buy Car DVD for BMW E90.

Audi Q5 DVD Player

Losing the direction can be much troublesome in any trip. Fortunately, in the modern life, not only your
friends and local people can provide you useful information, but also car dvd GPS navigation units can show you a
quick and correct route in a flash.The car player is a small security unit which you can easily place on your dashboard or stick on to your windscreen. The benefit of having an in-car dvd installed is that by simply keying in your required destination, it will give you real time turn-by-turn directions needed to reach the destination you want by voice.With the right GPS system, you will never have to ask for directions again or hear the dreaded question.If your car is Audi Q5, and the year is from 2008 to 2012,then pls read about this Audi Q5 DVD Player product information.Audi Q5 DVD Player is an all-in-one device which can perfectly fit to your Audi Q5.

Fit to these cars:
Audi Q5(2008-2012)

Quick Overview

Fit to: Audi Q5(2008-2012)
GPS yes Radio yes Digital TV opt.
DVD yes Bluetooth yes Camera opt.
Analogue TV yes Ipod yes Wi-Fi no
USB/SD yes Rearview yes 3G Net no
Easy on installation, don’t need to cut off the plastic and paste the plastic.
Shape very similar to original design.
Keep original car Bluetooth and Radio Function.
Keep the car power amplifier, and the sound quality will have not any damage.
Support  any function can control by CAR Center MMI knob.
Add DVD player and IPOD play Funtion.
Support  steering wheel control(Comprise DVD Function).
Gps navigation
1. Wince 6.0 operating system,samsung 2451 high speed mcu.
2. Built-in 64m ddr2 sdram,max speed to 667mhz.
3. SirfIII secondary planet incept module;position accuracy to 5meter,
4. 20 channel gps receiver
5. Can supports igo/tomtom/router66/papago……map of the world.
6. Dual zone function,can navigation and hear music at the same time.
Nowadays, the Internet has played a significant role in our study and work. A growing number of people tend to use many helpful functions of the Internet to satisfy their needs in the daily life. In the online life, shopping on the Internet is one of useful way full of benefits.When you use a computer with network to buy something, you can communicate with your friends and strangers through instant-messaging software while shopping on the Internet. For example, if you would like to buy a car DVD online, you can search for useful advices in the online community and discuss with your friends whilst viewing different kinds of car DVD players in the online stores.If you decide to buy one Audi Q5 DVD Player for your lovely car,then please don’t hesitate to try to buy it online.It will not let you disappoint.

Pay attention to the quality. Quality is as important as price. While choosing a cheaper in dash Honda
head unit, you mustn’t ignore the quality problems. Sometime the cheap product may save your money for
the buying moment, but it may not last for a long time. Generally, viewing some user ratings and reviews
may help you judge whether it is worth buying.In addition to the quality and price, another important factor you should consider is the features you need. It’s really no need to choose an Audi Q5 DVD Player that has functions you don’t use on a high price. Pick one that has only the features you really need.

Screen size is an important feature for GPS devices. A larger screen provides a larger map view and more
context to where you are and what’s coming up. But then again, the screen mustn’t be so big as be
termed bulky. I mean hey, you don’t want to carry a theatre around on your dashboard now, do you?
Ideally, something around 7.0 inches is best. Most GPS devices today are touch screen, so you
should definitely check out the quality and sensitivity of the screen before purchasing.It’s always better to choose a GPS that has a load of fun features like photo storage and mp3 playback. Bluetooth functionality allows you to synch your Bluetooth-enabled mobile phone for hands-free calling.

With the development of the society and technology, almost every family has a DVD player, but
one of the latest and coolest ways to electronically enhance your life is to install one into your car!
Car DVD players come in all different varieties and prices, but even the cheapest ones will give you a
very big surprise!With this lovely Audi Q5 DVD Player installed in your car, I think you and your family’s travel won’t lonely any more. And I think you will enjoy the convenience, happiness and security they take to you.

Mercedes-Benz SL-R230 DVD Player

Now more and more people have their own cars, and many people have started purchasing a car DVD player for their beloved car. That has become a trend.Some car DVD player can run the GPS navigation, and play music or show a TV programs at the same time. In fact, want to do like this, a car DVD player must have the function called Picture In Picture or PIP. Only with this function can you use two functions of DVD, TV, radio station, handsfree bluetooth, GPS and AUX simultaneously. What’s better, you can also zoom in or out the two show windows as per your requirement.

We will introduce one car dvd player for you.If your car is Mercedes-Benz SL-R230,and the year is from 2004.7 to 2009 year,then you should read this artical and try to buy one for your lovely car.It is Mercedes-Benz SL-R230 DVD Player.It has gps navigation function, dvd player, and some other functions. These means that you could watch dvds in the front seat, besides the gps navigation guide. The in-dash dvd gps comes with a 7.0 inch screen. It’s big enough to watch movie.

Quick Overview

Fit to: Mercedes-Benz SL-R230(2004.7-2009)
GPS yes Radio yes Digital TV opt.
DVD yes Bluetooth yes Camera opt.
Analogue TV yes Ipod yes Wi-Fi no
USB/SD yes Rearview yes 3G Net no

GPS DVD player is a kind of multifunctional car GPS navigator with DVD player, Bluetooth, ipod ready, and
so on. It is used in car GPS navigation system. The all in one unit could play DVD, VCD, CD, CD-R/RW and
MP3 while you are driving.If you are going on a long trip with kids, you may select a car entertainment for your kids. Then your kids can watch their favorite movies with this gadget in your vehicle. Then you don’t have to try many ways to calm them down.

Mercedes-Benz SL-R230 DVD Player parameter:

Critical parameter

Working voltage DC 10.5V-16V
Working current MAX 10A
Standby current <=50mA
POWER OFF current <1mA
Working Temperature -20°-60°
Storage Temperature -30°-70°

Hardware parameters

Processor SiRF Prima ARM11
Main frequency 600MHZ
DVD decode chip Sunplus SPHE8202T
DSP 300MHZ,for GPS decode
DDR 400MHZ,128M BYTE DDR1
FLASH SLC,MLC
USB USB2.0 OTG
FM module TDA7540
Bluetooth chip CSR car-mounted BC3

System parameters

Operation system WINCE 6.0 CORE
Support map Tomtom, IGO, Route 66,Papago etc
Video system automatic PAL/NTSC

Display

Display size 16:9
Screen Size 7 inch
Touch Screen yes
Screen Resolution 800*480 Pixels

GPS Navigation System

Chipset SIRF STAR 3,Sumsung 400Mhz
Frequency 1.575GHz
Channel number 20channels
Hot start time average 2s
Warm start time average 31s
Cold start time average 32s
Display output CVBS+S-VIDEO output
Audio output Stereo CD Quality
Support audio type MP3/PCM/WMA
Support video type ASF/AVI/WMV/DIVX
Tracking sense degree -159dbm
Position accuracy 10m, 2D RMS, WAAS enable
Velocity 0.1m/s
Data renewal rate 1Hz
Re-catching time average 0.1s
The biggest fixed height 18000m
The biggest velocity 515m/s
Power specification DV 12V, current<500mA
Consumption 4.5W(12V/360mA), normal 3W(12V/250mA)

The GPS navigation is one of the most popular practical functions for most drivers. Car GPS can be a very
important function for people driving to strange places or for long-distance journeys with a high
frequency. Now most models come with the GPS navigation system will not only provide people with the
basic information of the accurate location, but also offer people a clear electronic map with details of
correct direction, current speed, distance to the destination, plus expected time of arrival at the
destination. There are other practical functions such as Bluetooth can also be a good helper for people.
For people whether they are always driven to strange places or take self-driving travels or not, the
multimedia function may win a large popularity. Many people may have such experience of watching movies
with their friends or families in the cinema, but nowadays this can be achieved in the cars. With the DVD
player function, you can watch interesting movies with your friends or families when there are traffic
jams or it is a long driving journey.

When you have a long holiday after a long time hard work, you plan to have a good time with your beloved
ones. So you make a wonderful plan to go to a beautiful place, but how to avoid the boring journey when
you drive to the resort, how can you kill the boring time. What’s more, if you have little children, and
you plan to take them with you, I think you’d better do something to make them calm when they are very
crazy with the journey time. And this time, I think a good car DVD player is a wise choice.You just need to stay at the car and do as the GPS navigation orders. Mercedes-Benz SL-R230 DVD Player can not only tell you the basic information of your accurate location, but also offer you a clear electronic map with details of correct direction, current speed, distance to destination, plus expected time of arrival at your destination.

Car GPS offers geographic information for the driver, what’s more, it supports various languages, which are very convenient for the drivers come from different countries. When you use the GPS function, it will present you with an electronic map, you can zoom in or out the map so as to get a best view of location, route. And it will also show you the information of direction, distance, current speed and expected time of arrival.

 

Audi A4 DVD Player

An Audi A4 is always a safe bet. This car is not particularly flashy, but certainly world’s away from the prettiest pick up.you could return the car to the dealer and choose another one to drive off with. Basically, you lease another car under your name ‘ perhaps a newer Audi model or even a different car make which you think you will like driving around in, for the next few months.If you like the car so much, you could extend the lease. The maximum time for the second lease would still be for four years.However, they were not well suited to the extremes of temperature and vibration which are a normal part of the environment of an automobile. Audi A4 DVD Player enthusiasts were not satisfied with the sound quality of regular car sound systems, and with the advent of the CD player, they really had to start modifying some of these home stereos in order to work well in a car environment and voila!

Audi A4 DVD Player automobile digital video disc I don’t have that substantially price tag variety to obtain
an automobile digital camera revolutionary device. But you will uncover several possibilities obtainable
for me to pick a appropriate a single.automobile digital camera clearly it has a great deal a good deal far more useful capabilities like automobile gps AM/FM tuner and,TVv receiver and antenna and gaming play. based on many demands, its a item of cake to choose automobile digital video disc an best suited player.I wont be bored on the extended range trip or with the website site visitors jam.

If you ever are on lengthy generate then the auto digital video disc participant serves you like a boon to kill your time. Inserting a auto digital video disc participant into your auto will support everybody entertained. You can include a auto
digital video disc participant from the boot or below the seat. Adding a Audi A4 DVD Player might be an great method to include worth for you vehicle.

 Audi A4 DVD Player Fit to: Audi A4(2002-2008)  7 inch 16:9 800*480 digital high definition TFT LCD touch screen
2.Built-in GPS navigation system.Disc Play.Compatible with DVD-R/DVD-RW/DVD+R/DVD+RW/CR-R/CD-RW/CD-DA/MP3/WMA/HDCD/SVCD/VCD/MPEG/JPEG etc.mini USB and SD card.Support DIVX/MPEG/DAT/MOV/VCD/XVID/MP3/MP4/WMA/JPEG etc.AUX In Support.IPOD Support.Built in analog TV. Built in DVB-T as options.

Play and charge ipod and iphone
Supports album, playlist, genre, artist and track selection.The AUX input on front panel enables you to hook up with ipod, mp3/mp4 player, CD player etc and play through the car stereo system. It also features built in radio tuner with 30 preset stations and FM/AM with RDS function. The product provides you 2 SD slots for GPS and multimedia and can support up to 8GB memory. It also allows you to customize opening logo picture from SD card. This car accessory also
includes support on most cars’ steering wheel control. Among its safety benefits is the rearview camera
input which automatically switch to rearview when reverse gear is engaged.

Every useful entertainment unit has its own advantages to attract a number of users, and a Audi A4 DVD Player is no
exception. Due to its multiple functions on entertainment and convenience, the player has become a
popular model in the vehicle serving for the driver and the passengers.Now most car GPS systems generally have other additional functions, such as MP3/MP4, FM, Bluetooth, TV reception, DVD player and more. It can provide you with entertainment except for navigation. Thus, your driving will become more interesting and enjoyable.

There may be some signposts along the street serving for the guidance of direction, but sometimes you may still fail to find a way out. Even though you drive according to a route you know well, something unexpected may happen, such as a traffic jam.The Audi A4 DVD Player units are widely used in our daily life. They were used in the ships in the early time. However, today anyone who has a GPS receiver can access the navigation system freely. In order to have more convenience in the driving, now many DVD players come with a built-in GPS navigation system, and such a model is called Car DVD GPS.

Introduce to GPS

The Global Positioning System (GPS) is a space-based global navigation satellite system that provides reliable location and time information in all weather and at all times and anywhere on or near the Earth when and where there is an unobstructed line of sight to four or more GPS satellites. It is maintained by the United States government and is freely accessible by anyone with a GPS receiver. In addition to GPS other systems are in use or under development. The Russian GLObal NAvigation Satellite System (GLONASS) is for use by the Russian military. There are also the planned Chinese Compass navigation system and Galileo positioning system of the European Union (EU). GPS was created and realized by the U.S. Department of Defense (DOD) and was originally run with 24 satellites. It was established in 1973 to overcome the limitations of previous navigation systems.

The design of GPS is based partly on similar ground-based radio navigation systems, such as LORAN and the Decca Navigator developed in the early 1940s, and used during World War II. In 1956 Friedwardt Winterberg proposed a test of general relativity using accurate atomic clocks placed in orbit in artificial satellites. To achieve accuracy requirements, GPS uses principles of general relativity to correct the satellites’ atomic clocks. Additional inspiration for GPS came when the Soviet Union launched the first man-made satellite, Sputnik in 1957. A team of U.S. scientists led by Dr. Richard B. Kershner were monitoring Sputnik’s radio transmissions. They discovered that, because of the Doppler effect, the frequency of the signal being transmitted by Sputnik was higher as the satellite approached, and lower as it continued away from them. They realized that since they knew their exact location on the globe, they could pinpoint where the satellite was along its orbit by measuring the Doppler distortion (see Transit (satellite)).

The first satellite navigation system, Transit, used by the United States Navy, was first successfully tested in 1960. It used a constellation of five satellites and could provide a navigational fix approximately once per hour. In 1967, the U.S. Navy developed the Timation satellite that proved the ability to place accurate clocks in space, a technology that GPS relies upon. In the 1970s, the ground-based Omega Navigation System, based on phase comparison of signal transmission from pairs of stations, became the first worldwide radio navigation system. However, limitations of these systems drove the need for a more universal navigation solution with greater accuracy.

While there were wide needs for accurate navigation in military and civilian sectors, almost none of those were seen as justification for the billions of dollars it would cost in research, development, deployment, and operation for a complex constellation of navigation satellites. However during the Cold War arms race, the nuclear threat to the very existence of the United States was the one need that did justify this cost in the view of the US Congress. This deterrent effect is why GPS was funded. The nuclear triad consisted of the US Navy’s submarine-launched ballistic missiles (SLBMs) along with the US Air Force’s strategic bombers and intercontinental ballistic missiles (ICBMs). Considered vital to the nuclear deterrence posture, accurate determination of the SLBM launch position was a force multiplier.

Precise navigation would enable US submarines to get an accurate fix of their positions prior to launching their SLBMs. The US Air Force with two-thirds of the nuclear triad also had requirements for a more accurate and reliable navigation system. The Navy and Air Force were developing their own technologies in parallel to solve what was essentially the same problem. To increase the survivability of ICBMs, there was a proposal to use mobile launch platforms so the need to fix the launch position had similarity to the SLBM situation.

In 1960, the Air Force proposed a radio-navigation system called MOSAIC (Mobile System for Accurate ICBM Control) that was essentially a 3-D LORAN. A follow-on study called Project 57 was worked in 1963 and it was “in this study that the GPS concept was born.” That same year the concept was pursued as Project 621B, which had “many of the attributes that you now see in GPS and promised increased accuracy for Air Force bombers as well as ICBMs. Updates from the Navy Transit system were too slow for the high speeds that the Air Force operated at. The Navy Research Laboratory continued advancements with their Timation (Time Navigation) satellites, first launched in 1967, and with the third one in 1974 carrying the first atomic clock put into orbit.

With these parallel developments out of the 1960s, it was realized that a superior system could be developed by synthesizing the best technologies from 621B, Transit, Timation, and SECOR in a multi-service program.

Over the Labor Day weekend in 1973, a meeting of about 12 military officers at the Pentagon discussed the creation of a Defense Navigation Satellite System (DNSS). It was at this meeting that “the real synthesis that became GPS was created.” Later that year, the DNSS program was named Navstar. With the individual satellites being associated with the name Navstar (as with the predecessors Transit and Timation), a more fully encompassing name was used to identify the constellation of Navstar satellites, Navstar-GPS, which was later shortened simply to GPS.

After Korean Air Lines Flight 007, carrying 269 people, was shot down in 1983 after straying into the USSR’s prohibited airspace, in the vicinity of Sakhalin and Moneron Islands, President Ronald Reagan issued a directive making GPS freely available for civilian use, once it was sufficiently developed, as a common good. The first satellite was launched in 1989, and the 24th satellite was launched in 1994.

Initially, the highest quality signal was reserved for military use, and the signal available for civilian use was intentionally degraded (“Selective Availability”, SA). This changed with U.S. President Bill Clinton ordering Selective Availability turned off at midnight May 1, 2000, improving the precision of civilian GPS from 300 meters (about 1000 feet) to 20 meters (about 65 feet). The U.S. military by then had the ability to deny GPS service to potential adversaries on a regional basis.

GPS is owned and operated by the U.S. Government as a national resource. Department of Defense (DOD) is the steward of GPS. Interagency GPS Executive Board (IGEB) oversaw GPS policy matters from 1996 to 2004. After that the National Space-Based Positioning, Navigation and Timing Executive Committee was established by presidential directive in 2004 to advise and coordinate federal departments and agencies on matters concerning the GPS and related systems. The executive committee is chaired jointly by the deputy secretaries of defense and transportation. Its membership includes equivalent-level officials from the departments of state, commerce, and homeland security, the joint chiefs of staff, and NASA. Components of the executive office of the president participate as observers to the executive committee, and the FCC chairman participates as a liaison.

DOD is required by law to “maintain a Standard Positioning Service (as defined in the federal radio navigation plan and the standard positioning service signal specification) that will be available on a continuous, worldwide basis,” and “develop measures to prevent hostile use of GPS and its augmentations without unduly disrupting or degrading civilian uses.”