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From: bad sector <forgetski@_INVALID.net>
Subject: Re: app for precision coordinates
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On 6/26/24 01:41, Andy Burns wrote:
> bad sector wrote:
> 
>> I launch the F-Droid app GPSTest which tunes in a long list of 
>> satellites.
> 
> I tried the GPSaverage app, it's very basic, plots a position on a 
> circular grid every second, you might expect a perfect Gaussian cloud 
> where the centre was the average, but it gives linear streaks which are 
> probably due to the flyover paths of the satellites?


I'll get my wife to install GPSaverage on her iPhone, meanwhile I did 
some tests manually at two known surveyor pins by putting the phone down 
for 3-4 minutes at each and noted starting/ending readings (which showed 
steady unidirectional drifting). The two readings drifted south at both 
pins by 1.0-1.5 meters but all readings remained 3-4 meters in error 
overall throughout. I've noticed that surveyors leave some equipment out 
overnight or waiting for specific time windows. Maybe a much longer 
exposure interval is required.