With these devices the whole world is a town you know!!
GPS:-
The Global Positioning System (GPS) is a
space-based satellite navigation system that provides location and time
information in all weather conditions, anywhere on or near the Earth where
there is an unobstructed line of sight to four or more GPS satellites.The
system provides critical capabilities to military, civil and commercial users
around the world. It is maintained by the United States government and is
freely accessible to anyone with a GPS receiver.
Satellite navigation system:-
Satellite navigation is a system of
satellites that provide autonomous geo-spatial positioning with global
coverage. It allows small electronic receivers to determine their location
(longitude, latitude, and altitude) to high precision (within a few meters)
using time signals transmitted along a line-of-sight by radio from satellites.
The signals also allow the electronic receivers to calculate the current local
time to high precision, which allows time synchronization.
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