How many classes of VOR exist?

The correct answer is three classes of VOR (VHF Omni-directional Range) systems. These classifications are based on their operational capabilities and purpose in navigation.

The first class is VOR, which provides basic navigation information and is widely used for general aviation and commercial purposes. It serves as a reliable reference point for aircraft navigating through controlled airspace.

The second class is VOR/DME (Distance Measuring Equipment), which combines the basic VOR capabilities with distance information. This allows pilots to not only determine their direction relative to the VOR station but also to know how far they are from it, which enhances situational awareness and navigation accuracy.

The third class is the VOR with a specific purpose for approach procedures, such as in the case of Terminal VORs, which support more precise approaches to airports in busy terminal areas. Some VORs may also serve as part of standard instrument approaches, providing critical information in conjunction with other navigational aids.

This classification structure is essential for pilots to understand the different functionalities of VOR systems in their flight planning and navigation processes.