Which angle is measured between the Deck and Slant Planes?

The correct answer is Director Elevation, which refers to the angle between the deck and the slant planes in the context of naval gunnery and fire control systems.

In fire control, understanding the relationship between the director's elevation and the planes is crucial for accurate targeting and weapon system alignment. The director elevation determines how the sighting equipment is angled in relation to the ship's deck and slant planes, which aids in aiming weapons to engage targets effectively. This measurement is essential for compensating factors such as ship movement, atmospheric conditions, and projectile trajectory.

Other terms in the options, such as Slant Plane, Condition II, and Initial Alignment, represent different aspects of naval operations and fire control but do not specifically refer to the angle in question. Slant Plane pertains to the geometric plane defined by the weapon's firing position. Condition II typically refers to a state of readiness with ammunition and personnel, while Initial Alignment involves the pre-firing setup of systems. Understanding these distinctions helps clarify the unique role of director elevation in fire control operations.