With a heading indicator displaying 130 degrees and an automatic direction finder indicating 210 degrees, what heading should be used to proceed to the NDB with a fixed-card indicator?

To determine the correct heading to reach the NDB (Non-Directional Beacon) when given a heading indicator displaying 130 degrees and an automatic direction finder (ADF) indicating 210 degrees, it is essential to understand how to interpret the readings.

The heading indicator represents the aircraft's current heading, which is 130 degrees. The ADF points towards the bearing of the NDB, which, in this case, is at 210 degrees. To navigate effectively toward the NDB, the pilot must account for the difference between their current heading and the ADF indication.

The relationship between the current heading and the bearing to the NDB can be visualized. The aircraft needs to turn from 130 degrees toward the ADF's indicated 210 degrees. This involves calculating the required heading that would lead the aircraft to follow the bearing toward the NDB.

The difference between the two headings (210 degrees - 130 degrees) gives 80 degrees. In aviation navigation, to effectively reach the target (the NDB), the pilot typically must adjust for winds and may need a specific course correction. A heading of 210 degrees would lead directly to the NDB, but the aircraft must maintain a track that compensates for various navigational factors.