Google map on your Mobile phone

Google map on your mobile phone provides you easier & faster the way to acess local information . The idea behind the working of google map on your mobile phone is GPS ( GLOBAL POSITIONING SYSTEM ).
So let us know what is GPS ?
The Global Positioning System (GPS) is a satellite-based navigation system made up of a network of 24 satellites placed into orbit by the U.S. Department of Defense

Advantages of GPS
· GPS works in any weather conditions, anywhere in the world, 24 hours a day.
· There are no subscription fees or setup charges to use GPS.

WORKING
A GPS receiver calculates its position by measuring the distance between itself and three or more GPS satellite. Measuring the time delay between transmission and reception of each GPS microwave signal gives the distance to each satellite, since the signal travels at a known speed near the speed of light. These signals also carry information about the satellites' location and general system health (known as almanac and ephemeris data). By determining the position of, and distance to, at least three satellites, the receiver can compute its position using trilateration. Receivers typically do not have perfectly accurate clocks and therefore track one or more additional satellites, using their atomic clocks to correct the receiver's own clock error.

SOME FEATURES OF GOOGLE MAP ON YOUR MOBILE
You Are Here
Where's the nearest... cup of coffee, late night pizza or last-minute bouquet?
Is there traffic up ahead? See it so you can avoid it.
How do I get there from where I am? Type your destination and away you go.