Re: app for precision coordinates

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.