Sunday, August 29, 2010
What is GPS & Navigation ?
GPS is a functionality that allows a user to know his or her location and the location of points of interest using a Global positioning satellites
GPS
- The abbreviation GPS stands for "Global Positioning System".
- There are several satellites that orbit the globe. These satellites are constantly beaming down information to the earth. The GPS receiver in the phone or the device uses this information from a group of these satellites to determine the location of the phone on earth. GPS tells us where we are at that particular point in time.
A-GPS
- Assisted GPS (A-GPS) is a method to improve the usability of GPS. It enables the phone to obtain the satellite fix faster and more reliably. This results in faster positioning and hence significantly improved user experience. Assisted GPS requires an active GPRS connection in order to function.
- It works by sending a small amount of data using GPRS. This data helps providing GPS satellite information to the handset via the cellular network.
NAVIGATION
- Navigation gives us turn by turn voice guidance to help us get to where we want to go.
- Navigation does not need GPRS to work. Infact, Navigators will even work without a SIM card. However, some of navigators comes with A-GPS (Assisted GPS). This feature requires GPRS.
- Navigation also does not work indoors as it requires line of sight of the satellite to be able to give directions.
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