NavList:

I have just carried out a little experiment. I placed my phone on a table outside where it had a view of the clear sky. I waited until it was it had 15 satellites in view and was using 14 or 15 of them.  Sometimes it dropped to 14/13.   Both US and Russian satellites were used. Claimed accuracy was 5m - I assume this is calculated from the constellation.

Google Earth gives  positions to three decimal place of a minute. According to Mr Google 1 nm = 1852 m so the precision [1] of GE is approximately 2m.

My measurements were:

GPS    06.454'  S

           05.204' E

The app gave the numbers to four decimal places which implies more precision than is real.

Google Earth  06.457'  S

                      05.205' E

From which:

dlat = .003'    approx = 6m

dlong = .001'   At lat 41°  dep  approx equal 1.5m

Conclusion: At my location the GE and GPS positions agree within the claimed accuracy of the GPS.

There is a clear blue sky outside with no wind. I must take my sextant and determine the CORRECT position of my garden table (-;

[1] I am sure that precision is the correct word here, not accuracy.