What units are typically used by gyroscopic instruments?

Gyroscopic instruments in aviation primarily measure orientation and attitude in relation to Earth. They operate based on the principles of gyroscopic inertia, which allows them to maintain a constant reference direction. When considering the units connected to these instruments, the relevant measurements relate to angles and headings.

Degrees of rotation or degrees of heading are the most applicable units as they express the angular positions measured by gyroscopic devices such as the heading indicator, attitude indicator, and turn coordinator. These instruments provide critical data for pilots to maintain correct navigation and spatial orientation, especially in conditions where visual references are minimal.

The other options represent units that are not directly related to the function of gyroscopic instruments: knots and miles per hour pertain to airspeed; feet and meters focus on altitude; while pounds per square inch measure pressure, none of which relate to the angular measurements that gyroscopic instruments utilize.