gps is a navigation system which provides location and time information in all weather, using special gps satellites owned by the united states goverment.gps is freely accesable to anyone who owns a gps reciever .many big componies who specialize in mobile phones and electronical devices take advantage of gps. there is a wide range of apps avaliable which relie on gps



There are loadss of free GPS apps in the iTunes mega-store exsamples of that are

-AmAze GPS


amaze gps is a free turn-by-turn voice GPS app for the iPhone. You can view in 2D or 3D.

-auto miles

auto miles is a perfect app for people who need to track thier mileage for reimbursement.or

If you need to really keep track of where you are going and how much time and money you are spending.

-free gps

free gps is a simple free gps system application

-gps logbooks

this app is specifically made for pilots ,You can share your flight log book with the world using this handy dandy app. As you are flying, simply write a note, and it will update your online logbook with where you are when the post was created

- gps logger

GPS-Logger allows you to take pictures or add them in later and connect them to a specific location on a specific date.

types of devices which use gps

GPS devices work by utilizing the Global Positioning System, which is comprised of a series of earth-orbiting satellites that transmit both geographical and temporal data. A GPS device uses the data from these satellites to calculate its current location, which can be displayed in terms of latitude and longitude or, in some cases, as an image. The most common types of GPS devices available are car navigation system, handheld and marine GPS devices. the three exsamples are listed below

Car Navigation

Car navigation system GPS devices are designed to help you drive from point A to B. These particular GPS devices typically provide detailed road maps of an entire continent. In addition, car navigation GPS devices often provide step-by-step directions that have both visual and spoken cues so you do not have to take your eyes off the road. Other common features include POI (point of interest) indicators, which show you--on either a 3D or bird's eye view map


handheld GPS devices do not usually include 3D maps, and sometimes have no maps at all. Instead, handheld GPS devices rely on displaying the latitudinal and longitudinal coordinates of your position. If you know the coordinates of a desired location, enter them into a handheld GPS device and it will point the way. However, these directions may not take into account roads and other obstacles. Handheld GPS devices will also track your movements linearly on the screen--showing you a trail of where you have been--which makes them ideal for hiking, mountain climbing and other outdoor activities


All types of ocean, lake and river-going vessels use marine GPS devices. They provide detailed maps of seaways, port entries and other visual locations, and also display latitudinal and longitudinal positions