[1.] Guess the angle. The angle is indicated by a red arc.
[2.] With each incorrect attempt, an arrow will appear, indicating whether the search angle is larger (⬆️) or smaller (⬇️).
[3.] If the field with the angle turns gray, it means you are 6° or more away from the searched angle.
If it turns red, you are 5° or less away from the searched angle.