GPS program

Hi guys, can anyone tell me which GPS program is giving out an accurate data?
The data that I meant is Latitude, Longitude at least.

From the EM406 gps tester that I've downloaded, the data does not seem to be clear.
Does gs means ground speed? And what does groundspeed do and how does gps measures it?
And the altitude in metres does not seem to be clear. I am at level 7 and it's showing 100 over metres.
And how do I convert a Latitude of 14220578 to a standard form of displaying it in terms of degrees etc?

And the photo below is the program from EM406 GPS, why is there a need to divide the altitude and gs?




I am using the EM406 gps by the way. An accurate GPS is needed.. thanks in advance.

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