What indication confirms the required VOR system accuracy when the CDI centers?

The concept of VOR (VHF Omnidirectional Range) navigation involves understanding how to interpret indications from the Course Deviation Indicator (CDI). When the CDI centers on a specific course, it indicates that the aircraft is on the desired radial.

To confirm accuracy, using a TO indication means the aircraft is approaching the intended VOR station, thus validating that the course selection is correct. Selecting 183 degrees and receiving a TO indication indicates that the aircraft is on a trajectory toward that radial, confirming that the navigation system is functioning properly.

In contrast, the other options present scenarios where the information may not align with the intended course. A FROM indication, for example, implies that the aircraft is moving away from the VOR station, which does not confirm the VOR system accuracy in relation to maintaining the selected radial. Therefore, option A is correct as it confirms that during navigation toward a specific course, the CDI centering alongside a TO indication validates the required system accuracy.