Most of the people know about GPS. This has become our latest travel guide.Though it is not that prevalent in our country,we have two companies providing good services here-mapmyindia and satnav. The PDA costs us around 22k and maps of a city costs 2k.There are updates getting released every year which may cost upto 1k.
If u wonder how GPS works?,here is the working.when we switch on our PDA it starts running a digital wave form. the same wave form is sent by the satellites to our PDA. When this waveform is received our pda calculates the time lag between the two wave forms and gets its co-ordinates on earth. You having the map for that co-ordinates installed on your pda means exploring with second thoughts.
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