What is true about the reliability of VOR or TACAN bearing pointers during a compass system failure?

When considering the reliability of VOR (VHF Omnidirectional Range) or TACAN (Tactical Air Navigation) bearing pointers during a compass system failure, it is important to recognize that both systems provide navigational information independent of the magnetic compass. However, during a compass failure, the integrity and reliability of these bearing pointers should not be assumed without verification.

The correct answer emphasizes that the reliability of the VOR or TACAN pointers must be immediately verified. This is essential to ensure that the navigation information being utilized is accurate, especially when operating in critical phases of flight or in instrument meteorological conditions. Factors such as signal reception, potential interference, and system malfunctions can affect the accuracy of these navigational aids. Therefore, before relying on the information provided by VOR or TACAN during a compass system failure, pilots must confirm their functionality and reliability to ensure safe navigation.

In contrast, the other options imply various degrees of trust in the pointers without the necessary verification. Assuming that they are always accurate or trusting them until a new reading is taken can lead to significant navigation errors, which justifies the need for immediate verification. Moreover, the notion that they indicate an alternative heading may mislead pilots into thinking they are a substitute for the compass without