I have used LibreOffice for charts
Seriously: on satellite window long press "Hight" filed and you will find GPS SNR logging window. There you can start logging, in menu "Start CN0 log". At each 10 seconds GPS writes satellite status to a CSV log in \Logs\snr\ or \.System\Logs\snr\. I simple got a good satellite fix at both GPS, put them near window and started logging for 20 minutes.
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