Most EFIS/EHSI instruments can be set to display which data?

• A. Ground-based NAVAID data only
• B. FMS data only
• C. Ground-based NAVAID data, FMS data, or a combination of both
• D. Weather radar data only

Answer: (C)

EFIS/EHSI displays navigation information from multiple sources to give you a complete view of where you are and where you’re going. It can show ground-based NAVAID data such as VORs, VOR/DME, and ILS/localizer information, which helps you navigate using external radio aids. It can also display data from the FMS, like your active flight plan, next waypoint, leg distance, ETA, and altitude constraints. Most systems let you mix these sources on the display, showing both the external nav aids and the flight plan together for better situational awareness. Weather radar data, while available on some setups, isn’t universally included on the EFIS/EHSI by default, so the standard capability is to show NAVAID data, FMS data, or a combination of both.