Buzzard altimeter is stuck showing 600-700m with arrow rotating without any meaning.

Keeping in mind that Arma is not a flight sim and that In-game Flight instruments can be considered a cosmetic to a certain level.
But It is inconsistent quality compared to other in-game models. Where in other vehicles, e.g. (Hummingbird) altimeter works as intended.

Lack of quality in buzzard is due to it being ported from a previous game. But with coming Jets DLC it would be beneficial to have working Flight instruments.

Also The Attitude director indicator (located in the upper right part of flight deck is not working)