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Source: www.slashphone.com
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by Tracy V. Wilson
Imagine driving to a job interview and realizing that you're lost. Your first impulse would probably be to call the business that's interviewing you and ask for directions. But if you're not sure where you are, getting directions can be tricky.
But suppose you use your phone for another purpose -- to figure out exactly where you are and to get turn-by-turn directions to where you're going. New phones that include global positioning system (GPS) receivers can do exactly that. With the right software or service package, they can pinpoint your location, give directions to your destination and provide information about nearby businesses.
In this article, we'll review the basics of how cell phones and GPS receivers work. Then, we'll explore how phones combine these technologies.
Cell Phone BasicsA cell phone is basically a sophisticated two-way radio. Towers and base stations, arranged into a network of cells, send and receive radio signals. Cell phones contain low-power transmitters that let them communicate with the nearest tower.
As you travel, you move from one cell to another, and the base stations monitor the strength of your phone's signal. As you move toward the edge of one cell, your signal strength diminishes. At the same time, the base station in the cell you are approaching notices the strength of your signal increasing. As you move from cell to cell, the towers transfer your signal from one to the next.
In remote locations, towers may be so far apart that they can't provide a consistent signal. Even when towers are plentiful, mountains and tall buildings can interrupt their signals. Sometimes people have a hard time getting clear signals inside buildings, especially in elevators.
Even without a GPS receiver, your cell phone can provide information about your location. A computer can determine your location based on measurements of your signal, such as:
· Its angle of approach to the cell towers
· How long it takes the signal to travel to multiple towers
· The strength of your signal when it reaches the towers
Since obstacles like trees and buildings can affect how long it takes your signal to travel to a tower, this method is often less accurate than a GPS measurement.
GPS Receiver Basics
Like a cell phone, a GPS receiver relies on radio waves. But instead of using towers on the ground, it communicates with satellites that orbit the Earth. There are currently 27 GPS satellites in orbit -- 24 are in active use and 3 act as a backup in case another satellite fails.
In order to determine your location, a GPS receiver has to determine:
· The locations of at least three satellites above you
· Where you are in relation to those satellites
The receiver then uses trilateration to determine your exact location. Basically, it draws a sphere around each of three satellites it can locate. These three spheres intersect in two points -- one is in space, and one is on the ground. The point on the ground at which the three spheres intersect is your location.
A GPS receiver has to have a clear line of sight to the satellite to operate, so dense tree cover and buildings can keep it from getting a fix on your location.
GPS receivers and cell phones have a lot in common, and both are very popular. In the next section, we'll look at some of the features of GPS-enabled cell phones.
GPS Phones
Nearly all new cell phones sold in America have some GPS receiving capability built in. Those that don't can connect to a server that uses techniques discussed in the last section to analyze their signals and determine their location. This allows the phones to transmit a person's location to a Public Safety Answering Point (PSAP) after dialing 911. But that's all a lot of phones can do with their GPS.
However, some phones have a complete GPS receiver located in the phone or can connect to one with wires or through a Bluetooth connection. These GPS-enabled phones can understand programming languages like Java and can provide turn-by-turn directions or information about nearby businesses and attractions. Others can work like a tracking device. To use any of these features, you must have:
· A GPS-enabled phone or a compatible GPS receiver
· A calling plan that supports transmission of maps and GPS data
· A service plan or software that provides the actual maps and directions or provides information about the phone's location
Common uses for GPS phones include:
· Location Tracking: Some employers use GPS-enabled phones to track their employees' locations, and some business offer location tracking services for GPS-enabled phones. The Wherifone locator phone provides GPS coordinates and can dial emergency phone numbers. Parents and caregivers can track the phone's location by phone or online and can receive notification if it leaves a designated "safe area." Wearable Environmental Information Networks of Japan has also introduced the Dog @ Watch, a GPS watch phone for children.
· Turn-by-Turn Directions: GPS-enabled phones with view screens can often display turn-by-turn directions as well as announce them through the phone's speaker. In general, companies that offer these services charge a monthly fee and use a database of maps to provide the directions. The services are only as good as their database -- outdated maps can provide inaccurate directions. Some turn-by-turn direction services include:
o TeleNav
o ViaMoto
o MapQuest Find Me
o smart2Go, which requires a separate Bluetooth GPS receiver and a memory card
o Destinator SP, which is a software package for smartphones
· Outdoor Location Services: Trimble Outdoors offers maps and location-based services for hiking, mountain biking, geocaching and other outdoor activities.
· Other Location-Based Services: Some companies hope to deliver news, coupons, advertisements and other information to cell phone users based on their location.
Some other GPS-enabled phones include:
· Mio A701 Smart Phone
· Several Motorola phones offered through Sprint/Nextel
Follow the links on the next page for lots more information about cell phones, GPS systems and related technology.
Related HowStuffWorks Articles
· How GPS Receivers Work
· Cell Phone Quiz
· How Cell Phones Work
· How Buying a Cell Phone Works
· How Smartphones Work
· How Cell-phone Radiation Works
· How Radio Works
· How Microprocessors Work
· How Telephones Work
· How Intelligent Highways Will Work
· How Satellites Work
· How Location Tracking Works
· How Compasses Work
More Great Links
· GPS Cell Phone
· Global Positioning System Overview
· Cellular Telephone Basics
· Wireless-Assisted GPS
· GPS World
Sources
· Aquino, Grace. "GPS Phone Leads the Way." PCWorld, June 2004. http://www.pcworld.com/reviews/article/0,aid,115893,00.asp
· Ellison, Carol. "GPS Phone to Take the Stage at CTIA." eWeek.com, March 10, 2005. http://www.eweek.com/article2/0,1759,1774953,00.asp
· "GPS-Enabled Cell Phones Taking Off." TechWeb, September 16, 2004. http://www.techweb.com/wire/mobile/47212213
· "New GPS to be Built into Cell Phones, Study Says." InformationWeek, May 13, 2005. http://informationweek.com/story/showArticle.jhtml?articleID=163101789
· Hamblen, Matt. "Don't Count on Using your Cell Phone for Disaster Rescue." PC World, July 7, 2005. http://www.pcworld.com/news/article/0,aid,121744,00.asp
· Aquino, Grace. "Phones Use GPS to Show You the Way." PC World, August 2005. http://www.pcworld.com/news/article/0,aid,121417,00.asp
· Levy, Steven. "A Future with Nowhere to Hide?" Newsweek International, June 7, 2005. http://www.msnbc.msn.com/id/5093170/site/newsweek/
· Rojas, Peter. "Garmin Brings GPS to a Handful of Sprint Phones." Engadget, September 8, 2005. http://www.engadget.com/entry/1234000667057924/
Source : http://electronics.howstuffworks.com/gps-phone1.htm
Samsung INNOV8 also known as the i8510 is the company’s latest smartphone sporting Symbian S60 OS. The Innov8 takes the form of a slider handset having a 2.8-inch QVGA LCD capable of displaying 16 million colors.
In a move that has been very long in the making, Rogers has officially acknowledged that it will be carrying the Nokia E71 in the near future. With the N95 8GB being such a huge seller, Rogers is hoping that the E71 will prove to be popular not only with consumers who are seeking a device that offers a better compromise between business and pleasure, but with people who want a great 3G smartphone that isn’t the Bold or iPhone 3G. The specs of the Rogers E71 are as follows:
AT-T and Nokia announced the availability of the Nokia 6650, a stylish mobile device featuring the Symbian-based S60 platform. Designed with premium materials and customizable illumination, the stylish Nokia 6650 will be available to AT-T customers beginning Nov. 14 in red and silver, colors fit for the holiday season.
Verizon Wireless and Photobucket today announced the availability of a new mobile photo service on select Verizon Wireless handsets that enables Verizon Wireless customers to easily send photos from a mobile device to a Photobucket album. The application will launch exclusively for Verizon Wireless customers and cost a monthly subscription fee of $2.99. The subscription fee allows you to send unlimited mobile photos to your photobucket account.
This folks is something I have been waiting for ever since Kevin mentioned it even before the BlackBerry Developer Conference. Now while the wait was a little bit of a killer for me personally, I'm finally able to say the wait is indeed now over and was well worth the it. FlyCast has come to your BlackBerry and has come bringing all of what it promised.
After slight delays in October, the BlackBerry Bold has finally goes on sale in US, offered by AT-T. The BlackBerry Bold smartphone is available now for as low as $299.99. Unlimited corporate e-mail and data access via BlackBerry Enterprise Server or BlackBerry Professional Software are available from $45 a month when a qualified voice plan is also chosen. Voice plans start at $39.99 per month. BlackBerry Bold customers with unlimited data plans also qualify for free AT-T Wi-Fi service with more than 17,000 hot spots including Starbucks, Barnes and Noble and thousands of other locations.
Some matters if you wish to know about Blackberry Bold, follow this information.
The main things that stood out for me were the production quality of the games and the audio which is very high quality and just as importantly, very well integrated.
Nokia 7100 Supernova
Nokia 2330 classic, Nokia 2323 classic
The Nokia 1202 is Nokia’s lowest cost mobile device to date with price of €25. This phone includes standard features like a flashlight, extended battery life, loud ringtones and a phone book for up to five users and will be available in the fourth quarter of 2008.
The Nokia 1661 is Nokia’s lowest cost color phone including an FM radio, a large color screen, flashlight support, loud ringtones and multiple phonebooks. This phone is expected to hit the market in the first quarter of 2009 with a retail price of €30.[via Cellular News]
The BlackBerry® Storm™ 9530 smartphone has the power and performance to drive your desires. Find out how you can connect to your world.