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Consumer GPS positioning is typically accurate to plus or minus a few meters.
GPS.gov: GPS Accuracy -
VSC-drones seldom fly smoothly (path- heading- & gimbal pitch wise).
VIRTUAL STICK COMMANDS (vsc) -
Wind speed influences the drone’s behaviour.
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Changes in air pressure during flight will influence the drone’s altitude.
In other words: It’s normal behaviour.
Here’s an example using the methods @wesbaris mentioned.
‘Seasonal changes’