What type of electrical diagram for the steering control systems is shown in the illustration? Illustration EL-0192 Illustration EL-0192: the U.S. Coast Guard has not released this illustration.

Correct Answer: Option D — The diagram is a functional block diagram.

Functional block diagrams represent complex steering control systems by grouping components into interconnected blocks indicating signal flow and major functions. Under IEEE 45 and 46 CFR requirements, these diagrams assist marine engineers in isolating system faults without requiring component-level circuit details.