GPS for Dummies.pdf - Engineering Surveyor

Chapter 3GPS FundamentalsIn This Chapter Discovering how GPS works Understanding GPS capabilities and limitations Types of information you can get from a GPS receiver Getting familiar with common GPS receiver features Looking into the future of GPSYou’ve heard about GPS and probably know that it has something to dowith handheld gadgets and satellites that tell you where you’re located.That’s great for starters, but to understand and use GPS, you need a bit moredetailed knowledge. Follow this chapter to go through some of the fundamentalsof GPS so you have a better grasp of what it is and how you can use it.What Is GPS?GPS stands for Global Positioning System. A special radio receiver measuresthe distance from your location to satellites that orbit the earth broadcastingradio signals. GPS can pinpoint your position anywhere in the world. Prettycool, huh? Aside from buying the receiver, the system is free for anyone.You can purchase an inexpensive GPS receiver, pop some batteries in it, turnit on, and presto! Your location appears on the screen. No map, compass, sextant,nor sundial is required. Just like magic. It’s not really magic, though, buthas evolved from some great practical applications of science that have cometogether over the last 50 years.Other satellite Global Positioning Systems are either in orbit or planned, butthis book uses the term GPS for the Global Positioning System operated bythe United States government.