I appreciate that you are trying to help but I am fully aware of urban environments impacting GPS reception much like cloudy weather has an impact. Some of my tests that have taken over 2 minutes to get a GPS lock have been in a field a good 100m from any buildings and the only RF noise that I could pick up on the drone or my phone was my home WiFi. I didn't check for noise on 1.2ghz or 1.5ghz but it's the lock time that is really annoying I find. I sat there watching it go 5->9->10->12->9->10->12 satellites. I'm not sure but maybe the more expensive models have a-gps or something that gets them a better lock speed. If they at least cache its location they might get an assisted GPS log to help speed up location finding. It's why phones can get a much quicker lock as they'll have a complete database to cross reference rather than pure triangulation of the signals.
I take off from this point normally.
i can concur with you, when i started flying some two and a half years ago with cheaper drones, it was the norm then, clouds affect GPS signals and i avoided flying on very cloudy days because that is what i was being told by the media,According to the general consensus from many scientific studies of GPS signals, the overwhelming conclusions are that CLOUDS have extremely little to no effect on the GPS signals.
There are countless uses of GPS in commercial aviation and military applications that would be useless if clouds were detrimental and dangerous to the users.
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