What is this bar on the HUD?

Sometimes when opening Mission Planner there is a new bar on the HUD I’ve never seen before.
Could someone explain what is it for?



it is angle of attack, and only shows if it gets valid data. ie plane etc.

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Hello, please can you describe a little more about this bar, as you mentioned this is only for planes. When this appears? what do you mean by angle of attack? thank you!