Which of the following statements is true about the operational range limitation of VOR?

The statement about the operational range limitation of VOR being based on a line-of-sight limitation is accurate. VOR, or VHF Omnidirectional Range, uses VHF radio waves to transmit navigational signals. These signals travel in a straight line, which means that they can be obstructed by terrain, buildings, or other obstructions. The effective range of a VOR station depends significantly on the altitude of both the transmitter and the receiver. As altitude increases, the line of sight extends further, allowing a greater range for the VOR signal.

This is crucial for pilots to understand, as they need to maintain visual contact with the VOR signals while ensuring they are at an altitude where they can receive those signals unobstructed. In contrast, the other options imply either that VOR has no limitations or can function without consideration of line of sight, which does not align with the fundamental characteristics of how VOR systems operate. Understanding this limitation helps pilots effectively utilize VOR for navigation while being mindful of potential obstructions.