At which aircraft position would you receive OMNI indication X?

The choice indicating that positions 1 and 3 would provide an OMNI indication X is correct because of how OMNI navigation systems operate. An OMNI (Omnidirectional) indicator is designed to display the relative bearing to a station regardless of the aircraft's heading.

When positioned at point 1, the aircraft is likely within the reception range of the navigational aid, and the grounding indicators will show a consistent direction to the station, indicated as X in this scenario. This is typical behavior of an OMNI navigation system, as it gives pilots directional guidance toward the intended navigational aid.

Moving to position 3, depending on the orientation of the aircraft and the location of the navigational aid, this position is also likely to receive a valid OMNI indication as indicated by X. The navigation signal received at this position again supports the principles that define how an OMNI system works, allowing it to give relevant directional information.

Position 2 does not provide a valid signal in this situation based on the layout and reception capabilities. Thus, option C correctly identifies the positions (1 and 3) that would yield the OMNI indication needed for proper navigation use. Understanding the function of OMNI systems and how they interact with different aircraft positions is