If your VOR needle is centered and the To/From indicator is unserviceable, what adjustment can clarify the ambiguity?

When the VOR needle is centered, it indicates that you are on the radial of the VOR station; however, without a serviceable To/From indicator, you cannot determine if you are flying towards or away from the station. To resolve this ambiguity, updating the Orientation Bearing Selector (OBS) can help clarify the situation.

By rotating the OBS 10° to 160°, you strategically change your reference point. This means you will effectively direct your flight path to a new radial that is incremented from the VOR’s magnetic bearing. If the VOR needle remains centered, it confirms that you are still on the new radial. If, however, you notice the needle moving to the right or left, it will indicate the direction you need to turn to re-center the needle, which can help you infer whether you are traveling toward or away from the station based on your adjustments.

This method of rotating the OBS allows for a systematic way to analyze your position relative to the VOR station, effectively removing the ambiguity surrounding your bearing.