Which NAVAID is subject to the same line-of-sight restrictions as VORs and provides magnetic courses?

The correct choice is TACAN, which stands for Tactical Air Navigation. This navigational aid operates similarly to VORs (VHF Omnidirectional Range) in that it provides magnetic bearing information. TACAN is primarily used by military aircraft, but it is also compatible with civilian aircraft because it can provide distance measuring capability along with the directional information.

Like VORs, TACAN is subject to line-of-sight restrictions, meaning that the signal can only be received over limited distances, which depend on altitude and terrain. This characteristic is significant because it implies that effective range can be impacted by physical obstacles like mountains or buildings.

In contrast, other navigational aids listed in the choices do not share the same functional and operational characteristics. For instance, DME (Distance Measuring Equipment) does not provide bearing; it only offers distance information relative to the DME station. NDB (Non-Directional Beacon) provides azimuth information but is not subjected to the strict line-of-sight limitations that affect VORs and TACAN due to its lower frequency and longer wavelength signals. VOR, while a valid choice regarding magnetic courses and line-of-sight, is already established as a reference point in the comparison with TACAN, which is more