How does a non-directional beacon (NDB) assist pilots during navigation?

A non-directional beacon (NDB) assists pilots during navigation by sending a radio signal that provides the necessary information for bearing determination. Pilots can use the direction of the radio waves emitted by the NDB to navigate towards the beacon or assess their position relative to it. This allows for navigation even when visibility is poor, as the NDB itself does not rely on visual references.

The signal emitted by the NDB is not only useful for determining the aircraft's bearing, but also allows pilots to use their aircraft's onboard navigation instruments to hone in on the beacon's location. By tracking the strength and direction of the signal, pilots can effectively navigate along defined routes or towards specific locations.

In contrast, visual guidance from the ground, weather indication, and automatic landing capabilities involve different systems and technologies that are not related to the fundamental purpose of an NDB. Therefore, the primary role of an NDB is indeed to facilitate navigation through the provision of a radio signal for bearing determination.