I was just tracking a flight that I'll be taking next Monday and I noticed that there are occasional changes in altitude, usually 60 or 120 feet, logged during the flight. Obviously, aircraft don't always fly every single second at the exact altitude chosen (due to changes in wind, etc.) and the autopilot corrects it back to that desired altitude.
You can see an example here at 8:44 am and again at 8:51 am:
My question is are these minor changes simply adjustments by the autopilot that are enough to be logged? Are they also indicators of turbulence?
As for speed, are the ripples seen in the graph simply changes in wind direction that cause the speed to increase/decrease? I would imagine once cruising altitude is reached, the engines pretty much stay at the same power unless they need to be adjusted.
While I have issues with feeling like I don't have any control, flying is still truly fascinating to me.