VHF direction finding (VDF) accuracy relative to VOR: the statement “VDF just isn’t as accurate as a VOR” is true or false?

VHF direction finding (VDF) accuracy relative to VOR: the statement “VDF just isn’t as accurate as a VOR” is true or false?

• A. True
• B. False
• C. N/A
• D. Cannot be determined

Answer: (B)

VDF accuracy can be effectively on par with VOR under proper installation and good signal conditions. A VDF determines bearing to a ground station by comparing signals received on its antennas, and when the system is well-calibrated and the signal is clear, the resulting bearing error can be only a few degrees—similar to what a VOR provides. Because of this, the claim that VDF is inherently less accurate than a VOR isn’t necessarily true in practice. Keep in mind that real-world factors like multipath, signal strength, and calibration affect VDF performance. But these same factors also influence VOR accuracy, and with modern VDF equipment and proper maintenance, the bearing accuracy can meet the needs of typical navigation tasks.

VDF accuracy can be effectively on par with VOR under proper installation and good signal conditions. A VDF determines bearing to a ground station by comparing signals received on its antennas, and when the system is well-calibrated and the signal is clear, the resulting bearing error can be only a few degrees—similar to what a VOR provides. Because of this, the claim that VDF is inherently less accurate than a VOR isn’t necessarily true in practice.

Keep in mind that real-world factors like multipath, signal strength, and calibration affect VDF performance. But these same factors also influence VOR accuracy, and with modern VDF equipment and proper maintenance, the bearing accuracy can meet the needs of typical navigation tasks.