Which of the following is NOT used for GPS-based approaches?

Which of the following is NOT used for GPS-based approaches?

• A. ADF
• B. DME
• C. NDB
• D. RNAV

Answer: (C)

A Non-Directional Beacon (NDB) is not used for GPS-based approaches. GPS-based approaches rely on satellite navigation for accurate positioning and guidance, which is fundamentally different from the traditional ground-based navigation aids. While NDBs provide navigational assistance, they operate based on radio signals from ground stations and do not integrate with GPS technology. In contrast, RNAV (Area Navigation) systems directly utilize GPS technology for navigation, allowing for more flexible flight paths and approaches. DME (Distance Measuring Equipment) is often used in conjunction with other navigation systems, including GPS, to provide distance information. ADF (Automatic Direction Finder) also works with NDBs but is not directly related to the functioning of GPS-based approaches. Therefore, the correct answer highlights that NDBs do not align with the technology utilized for GPS approaches, whereas the other options do provide support for GPS-enabled navigation and approach procedures.

A Non-Directional Beacon (NDB) is not used for GPS-based approaches. GPS-based approaches rely on satellite navigation for accurate positioning and guidance, which is fundamentally different from the traditional ground-based navigation aids. While NDBs provide navigational assistance, they operate based on radio signals from ground stations and do not integrate with GPS technology.

In contrast, RNAV (Area Navigation) systems directly utilize GPS technology for navigation, allowing for more flexible flight paths and approaches. DME (Distance Measuring Equipment) is often used in conjunction with other navigation systems, including GPS, to provide distance information. ADF (Automatic Direction Finder) also works with NDBs but is not directly related to the functioning of GPS-based approaches. Therefore, the correct answer highlights that NDBs do not align with the technology utilized for GPS approaches, whereas the other options do provide support for GPS-enabled navigation and approach procedures.