How GPS Navigation System Works

In the civilian market, Global Positioning System navigation is used most often for turn-by-turn navigation devices, which, as they’ve matured, have plummeted in price and increased in features. Now, the technology even works as a smartphone application. Other uses of GPS include marine and aviation navigation systems, Internet network timekeeping, and monitoring the time and position of delivery trucks, pet collars and even children.

How GPS Works

The GPS system consists of 24 satellites in an orbiting constellation around the earth, with four in-orbit spares, as of October 2012. The U.S. Air Force launches replacement satellites on a regular basis every 2 to 3 years, replacing the oldest ones currently in service to keep features updates. Each satellite broadcasts a constant signal that includes a time stamp derived from an on-board clock, and the satellite’s orbital information.

A ground-based receiver tries to “spot” four or more satellites at once to get a positional fix, treating each signal as the radius of a sphere – four overlapping spheres will have a unique intersection point, which is converted into a latitude, longitude and altitude.

Accuracy of GPS Positions

In the United States, GPS receivers are good for positional fixes down to around ten yards on the horizontal plane, and anywhere from fifteen to twenty yards in altitude. Military GPS receivers also use a ground based triangulation point that also broadcasts a signal, and, within the map coordinates selected, are accurate down to a foot or less.

Prior to 2000, civilian GPS systems had integrated timing errors limiting precision to around 150 meters on the ground. Current regulations by the US Department of Commerce prevent GPS receivers from reporting altitudes in excess of 60,000 feet — airliners travel at 35,000 feet — and positions and speeds greater than 999 miles per hour.

GPS Devices and Mapping Software

What most people think of when they hear the term GPS is actually an integrated GPS device and map display. Map displays show cartographic data with terrain features, street names and distances between intersections. In concert, a combined GPS and Geographical Information System can show where your vehicle is on a street map.

Because street maps and addresses change regularly, maps need to be updated frequently; most mapping software is switching to a subscription model where updated maps are rolled out at a regular basis as long as the annual fee is paid.

Other GPS Navigation Tools

GPS coordinate fixes and charting software is used for civilian and military marine navigation. Similar to land maps, these have maps of the depths of various bodies of water, and integrate tidal patterns. Higher end models overlay weather information on top of the marine chart.

GPS mapping software is also available as a smartphone mapping application; while the screen of a typical smartphone isn’t ideal for using in a car — at least not without a phone dashboard mount — they can be quite handy for pedestrians, or people hiking in the woods. There are also dedicated hand-held GPS systems that don’t have integrated map displays – they just provide GPS coordinates, and are used for land orienteering and hiking.

ARTICLES

How to Make Safe Indoor Play Equipment for Toddlers It's crazy to think that just a short time ago, your 1-year-old was a tiny, sleepy bundle. Now she's likely creeping on the furniture, or maybe even w...
Electronic Arts,Los Angels:Customer Care Number Sevenbucket .com will support Customer Care Support& Customer Support Technical Assistance & Customer Email Support Assistance like Telephone ...
GlaxoSmithKline Pharmaceuticals Customer Service Numbers Welcome to Sevenbucket.com It is the source of customers’ trust and .sharing reliable information about Company’s around the world. We provide all Com...
How To Know Signs of a Toddler’s Temper Tantrum Temper tantrums are enough to make any parent want to scream and bang her head against the wall. Some days, they seem to sneak up out of nowhere. Just...
Apple Retail Store Japan Customer Service Number Japan Welcome to Sevenbucket.com It is the source of customers’ trust and .sharing reliable information about Company’s around the world. We provide all Com...
How To Make Phonics Activities for Preschoolers If the term phonics or "phonemic awarness" sounds more like a medical diagnosis than something you should be teaching your preschooler, fear not: teac...
How To Share Morning Visual Checklist for a Toddler Skip Mornings with a toddler aren't always sunshine and rainbows. Getting your toddler to follow directions in the rush of a busy morning may cause tears a...
How Many Problems With Oral Health During Teething Skip Most parents adore that toothless gummy grin, but whether you like it or not, teeth begin to surface as your baby turns around 6 months old and his fi...
How to use Thanksgiving Coloring Games for Kids Skip While the turkey's cooking and you are trying to get the potatoes lump-free, occupy the kids with fun-filled Thanksgiving coloring games. Instead of p...
How to make the Advantages of Craigslist Science Skip One of craigslist’s greatest advantages is its clean, image-free graphical user interface. This lets you find what you need without requiring a site m...
How To Take Multiple Strategies For Toddlers Disciplining As your toddler throws his toys across the room and begins screaming at the top of his lungs, you think back to when he was a baby and didn't talk bac...
Any Idea To Find To Right Insurance Company? If you are a house owner like me then I am sure you will value your home and valuables as highly as I do. One thing that I designed sure of as soon as...
How To Share Mini Notebook Computer Comparison Although they were never as successful as analysts once thought they'd be, netbooks are still a great option for someone needing an inexpensive, highl...
Altera customer service support phone number Altera customer service support phone number Are you looking for Altera customer service support phone number & Customer Email Support Assistance...
A Century Limousine: Customer Service & Support Number Are you looking for A Century Limousine and Customer support service number & Email Support, We are here to help, enhance, and impressive the cust...
Leaving Your Military Medals to Your Children Skip Military medals are something to be proud of. So is being a parent.  It's understandable that it occurs to many military and ex-military service peopl...
How To Make Importance of a Good Parent-Provider Relationship Skip Even if your childcare provider is the one who teaches your toddler those cute little songs that he sings every single day (until you feel like you mi...
GolfOutlets: Customer Service & Support Number Across Universe Are you looking for GolfOutlets and Customer support service number & Email Support, We are here to help, enhance, and impressive the customer sat...
How to use Spanish-Themed Physical Activities for PreschoolersSkip Kids need to get out and work off their energy, even as they're learning. If a child sits still for too long, she loses focus and can't absorb informa...
Is AT&T U-verse Viral Service Available Everywhere ? AT&T; U-verse is available in select states across the nation. The service employs fiber optic technology and computer networking to provide subsc...
TD Bank 24/7 Customer Service Phone Numbers Are you looking for  Customer Care Support& Customer Support Technical Assistance & Customer Email Support Assistance like Telephone Number  ,...
Royal Dutch Shell Netherlands : 24/7 Customer Service & Support Number Are you looking for Royal Dutch Shell Netherlands customer service phone number, We are here to help, enhance, and impressive the customer satisfactio...
Air Force Exchange 24/7 Customer Service Phone Numbers Are you looking for  Customer Care Service &  Support Technical Assistance ,Customer Email Support Assistance like Telephone Number  ,Mobile Numbe...
Albania Banks Customer Service Phone Numbers Albania Banks Customer Service Phone Numbers In this article I am Listed  Albania Top Banks Customer Service Phone Number like technical support and ...
How Emergent Literacy Can Affect Your Little Toddlers If you think that "emergent literacy" is just the latest in a long stream of early childhood buzz words, think again. Although your young child might ...