Which button on the UFCP is used to transmit the pulse that aids in immediate identification on a controller's scope?

• A. DIR
• B. ID
• C. MRK
• D. EXEC

Answer: (B)

Identifying yourself on the controller’s radar relies on the transponder sending an identification pulse. On this UFCP, pressing the ID button triggers that identification signal, so your aircraft appears clearly and immediately as identified on the radar scope. The other buttons don’t perform that identification function: DIR handles directional or display-related inputs, MRK sends a marker beacon signal used for approach markers, and EXEC applies or confirms the current selections.