How are heading and course set on the EHSI?

The heading and course are set on the Electronic Horizontal Situation Indicator (EHSI) using the HDG (Heading) and CRS (Course) knobs located on the EFIS (Electronic Flight Instrument System) control panel. This interface allows pilots to manually input or adjust their heading for navigation, ensuring they are oriented correctly relative to their desired flight path. The HDG knob adjusts the aircraft's current heading, while the CRS knob sets the desired course to be followed. This functionality is crucial for flight management and helps pilots maintain situational awareness regarding their flight trajectory.

The other options focus on different systems or methods not directly designed for adjusting heading and course on the EHSI. The EADI knobs, for instance, are primarily for the Electronic Attitude Direction Indicator and would not be relevant for setting heading and course on the EHSI. The GPS command console typically provides navigational data but does not directly adjust the EHSI settings. Autopilot settings are used for maintaining control of the aircraft during flight, but they do not involve manually setting the heading or course on the EHSI—the task is specifically carried out via the EFIS control panel knobs.