Commercial Pilot License (CPL) 2025 – 400 Free Practice Questions to Pass the Exam

The correct option relates to how course sensitivity on a VOR (VHF Omnidirectional Range) is assessed through the rotation of the OBS (Omni Bearing Selector). When pilots check course sensitivity, they rotate the OBS from the center position until they observe that the indicator has moved to the last dot on the VOR display. This movement typically indicates a change in course sensitivity of about 10-12 degrees. Understanding this process is crucial for pilots as it helps them maintain the desired course and make necessary adjustments while navigating.

The other options do not effectively measure course sensitivity. Observing the number of dots on the VOR display (as mentioned in the first option) can indicate signal quality but doesn’t provide a specific measure of course sensitivity. Observing the number of aircraft in the vicinity does not relate to the sensitivity of the VOR system, as it does not help in understanding how finely the course can be adjusted. Lastly, while comparing VOR readings to GPS can provide insights into navigational accuracy, it does not specifically address how course sensitivity is checked using the VOR system itself.