Garmin GTX 330 Pilot's Guide - Page 5

When the transponder code is changed, a notification is sent to ATC by the GTX 330. This notification is temporary and may not be sent if the GTX is not active (i.e., set to ON, ALT or GND) when the code is changed. NOTE: On a dual transponder installation, change the code on the active transponder. This ensures the notification is transmitted to ATC. Keys for Other GTX 330 Functions IDENT Pressing the IDENT key activates the Special Position Identification (SPI) Pulse for 18 seconds, identifying your transponder return from others on the air traffic controller's screen. The word IDENT will appear in the upper left corner of the display during this time. VFR Sets the transponder code to the pre-programmed VFR code selected during installation configuration (this is set to 1200 at the factory). Pressing the VFR key again restores the previous identification code. If the VFR Key is pressed when disabled (dependent upon installation configuration) a VFR Key Disabled message appears to indicate that no operation took place. FUNC Changes the page shown on the right side of the display. Display data includes Pressure Altitude, Flight Time, Altitude Monitor, Count Up, and Count Down timers. Also displays Outside Air Temperature, Density Altitude, Contrast, Display, and ADS-B Operation (dependent upon installation configuration). START/STOP Starts and stops the Altitude Monitor, Count Up, Count Down, and Flight timers. CRSR Initiates starting time entry for the Count Down timer and cancels transponder code entry. CLR Resets the Count Up, Count Down, and Flight timers. Cancels the previous keypress during code selection and Count Down entry. Returns cursor to the fourth code digit within five seconds after entry. 8 Reduces Contrast and Display Brightness when the respective fields are displayed (dependent upon installation configuration) and enters the number eight into the Count Down timer. 9 Increases Contrast and Display Brightness when the respective fields are displayed (dependent upon installation configuration) and enters the number nine into the Count Down timer. Aft (ATCR ensurin commu When be entered code chan notice tran the associ activated NOTE dual trans GTX 330(