What is the correct OBS setting for performing a VOT VOR test in order to check accuracy?

To perform a VOR test using a VOT (VOR Test Facility), the correct OBS setting involves selecting the course to 360° with a FROM flag. This setting is crucial for accurate testing because the VOT transmits a specific VOR signal that allows pilots to check the operational accuracy of their navigation equipment.

When the OBS is set to 360° with a FROM flag, the signal received should indicate a three-degree tolerance for accuracy, confirming that the navigation system is functioning correctly. If the VOR receiver shows a FROM indication while set to 360°, it means the aircraft would be flying away from the VOT station correctly.

Using this specific configuration ensures that the pilot is able to validate that their VOR equipment is reading accurately in relation to the known ground reference provided by the VOT, which contributes to safe navigation practices.