Which instrument is used to point to an NDB?

The correct instrument used to point to a Non-Directional Beacon (NDB) is the ADF (Automatic Direction Finder). The ADF is specifically designed to determine the direction to an NDB by using radio waves transmitted from the beacon. When the ADF receives these signals, it provides the pilot with a bearing to the station. This capability makes it an essential tool for navigation, especially for approaches and during flights where visual cues may not be available.

In contrast, a VOR (VHF Omnidirectional Range) indicator is used for directional navigation but is specifically designed for VOR stations, not NDBs. An ILS receiver is primarily used for precision instrument approaches involving localizers and glide slopes, thus it does not connect to NDBs. Lastly, a radar altimeter is used to measure the altitude above the ground, and it does not provide navigation guidance to a beacon. Therefore, the ADF is the correct choice when navigating to an NDB.