Garmin GTX 328 Pilot's Guide - Page 5

Important Codes: 1200 The VFR code for any altitude in the US (Refer to ICAO standards elsewhere) 7000 The VFR code commonly used in Europe (Refer to ICAO standards) 7500 Hijack code (Aircraft is subject to unlawful interference) 7600 Loss of communications 7700 Emergency 7777 Military interceptor operations (Never squawk this code) 0000 Military use Avoid selecting codes 0000, 7500, and all codes in the 7600-7777 range. These codes trigger special indicators in automated facilities. An aircraft's transponder code is used for ATC tracking purposes, therefore exercise care when making routine code changes! Keys for Other GTX 328 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 while the IDENT mode is active. VFR Sets the transponder code to the pre-programmed VFR code selected in Configuration Mode (this is set to 7000 at the factory). Pressing the VFR Key again restores the previous identification code. If the VFR Key is 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, and Display (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.