What does a VOR test facility (VOT) transmit?

A VOR test facility (VOT) is designed to provide a means for pilots and maintenance personnel to check the accuracy of VOR receivers. The key role of a VOT is to transmit a signal that indicates the reference radial, which is specifically a 360-degree radial. This signal is emitted in all directions, allowing pilots to align their aircraft's VOR indicators to ensure they are receiving accurate directional information.

When a VOT is functioning properly, it sends a continuous signal that represents a 360-degree radial, which corresponds to true north. This is crucial because it allows pilots to effectively verify the performance of their VOR equipment by tuning into the VOT frequency and checking their indicators. If the equipment shows 360 degrees when the VOT is active, the VOR receiver is working correctly.

Understanding the function of a VOT is essential for flying operations, as relying on accurate navigation aids is vital for safe flight. This is why the choice indicating a 360-degree radial in all directions is the correct response.