What does the suffix 'N' imply about the aircraft's transponder capabilities?

The suffix 'N' indicates that the aircraft is equipped with a transponder that does not have Mode C capabilities, which are essential for providing altitude reporting. This designation is important for air traffic control, as it informs controllers that while the aircraft can transmit its position and identify itself, it cannot provide altitude information that would typically enhance situational awareness and safety in airspace management.

In this context, having "TACAN only" aligns with the capabilities stated, suggesting that the aircraft may be using a Tactical Air Navigation system, but is not configured with further capabilities such as altitude encoding. This is crucial for ATC to determine the appropriate separation and management of air traffic, especially in busy airspaces where altitude information is vital.