To which stations can RMI bearing indicator needles point if navigation receivers are installed?

The RMI (Radio Magnetic Indicator) bearing indicator is a versatile navigation tool that can display bearings to different types of navigation aids. Specifically, when navigation receivers are installed in an aircraft, the RMI can indicate bearings to both NDB (Non-Directional Beacon) and VOR (VHF Omnidirectional Range) stations.

This is because the RMI works by interpreting signals from these ground-based navigation aids. For NDBs, the RMI needle points toward the NDB station, providing a continuous indication of the aircraft's bearing to the station. Similarly, with VOR stations, the RMI can display the aircraft’s position in relation to the VOR radial being tracked, again providing vital navigation information.

In contrast, GPS stations do not operate in the same manner as NDBs and VORs when it comes to needle bearings; GPS systems provide positional data in a different format (latitude and longitude) rather than directional bearings which an RMI would interpret.

Thus, since the RMI can indeed point to both NDB and VOR stations, the correct choice confirms that the indicator serves a dual purpose in aiding navigation by utilizing signals from both types of stations.