Which navigation capability is mandatory for many IFR routes?

Which navigation capability is mandatory for many IFR routes?

• A. RNAV
• B. VOR/DME
• C. ADF
• D. INS

Answer: (A)

Modern IFR routes are often designed as RNAV routes, which require the ability to navigate using area navigation rather than relying solely on fixed ground-based beacons. RNAV lets an aircraft determine its position and fly a path defined by waypoints, enabling direct routing between points and more efficient, flexible airspace use. Because these routes depend on accurate position information from RNAV systems (such as GPS or other positioning sources), having RNAV capability is mandatory on many en-route and terminal procedures. Ground-based aids like VOR/DME can still be present in some areas, and older systems like ADF/NDB or INS alone are not generally sufficient to meet the navigation requirements of these routes. RNAV provides the needed precision and flexibility, making it the required capability for many IFR routes.

Modern IFR routes are often designed as RNAV routes, which require the ability to navigate using area navigation rather than relying solely on fixed ground-based beacons. RNAV lets an aircraft determine its position and fly a path defined by waypoints, enabling direct routing between points and more efficient, flexible airspace use. Because these routes depend on accurate position information from RNAV systems (such as GPS or other positioning sources), having RNAV capability is mandatory on many en-route and terminal procedures. Ground-based aids like VOR/DME can still be present in some areas, and older systems like ADF/NDB or INS alone are not generally sufficient to meet the navigation requirements of these routes. RNAV provides the needed precision and flexibility, making it the required capability for many IFR routes.