Internet vs NTP Server

about INTERNET  NTP vs GPS Ntp which is Better to synchronize to clients.please share  the Documents of Internet NTP
venkata s  s sharma AradhyulaSr. system administratorAsked:
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als315Commented:
There are no correct answer to your question without details. If you have "closed" system, without access to internet, the only choice will be GPS. In this case you should have own ntp server and maintain it. Usually we are using internet NTP servers, because it is easy.
venkata s s sharma AradhyulaSr. system administratorAuthor Commented:
which is better sir Internet or GPS NTP
venkata s s sharma AradhyulaSr. system administratorAuthor Commented:
WE HAVE All india clients ,they will get unique Time.if internet fail also they will maintain unique Clock.which is better
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als315Commented:
What is your criteria of "better"?
venkata s s sharma AradhyulaSr. system administratorAuthor Commented:
i want unique clock
als315Commented:
What do you mean under "unique clock"?  Can you describe your system?
venkata s s sharma AradhyulaSr. system administratorAuthor Commented:
if communication fail also they will maintain unique clock
als315Commented:
If you want to have channel independent clock, you should use GPS
venkata s s sharma AradhyulaSr. system administratorAuthor Commented:
how did find the  GPS Clock ,is it connect MASTER Clock
als315Commented:
You need GPS receiver and software.
Description for ubuntu you can find here:
https://blog.rapid7.com/2015/07/27/adding-a-gps-time-source-to-ntpd/

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venkata s s sharma AradhyulaSr. system administratorAuthor Commented:
IN Windows Operating system how did ?, can you share
venkata s s sharma AradhyulaSr. system administratorAuthor Commented:
our all clients working in windows operating systems,could you share the process how did test GPS Clock
als315Commented:
I don't know free software for windows, you should buy some device with software, like this:
https://www.netburner.com/products/network-time-server/pk70-exntp
But you can use old computer with ubuntu and cheap GPS receiver and set it as a ntp server for your windows machines
als315Commented:
You can test this software:
https://www.coaa.co.uk/gpstime.htm
or this (demo version):
http://www.visualgps.net/#nmeatime2-content
als315Commented:
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