Garmin GNC 420W Pilots Guide - Page 17

Selecting COM Frequencies While the GNC 420 is acquiring a position, take a minute to dial in the active and standby frequencies to be used for the first phase of the flight. The GNC 420's display (Figure 1-12) is divided into separate windows (or screen areas), including a COM Window, data field (distance), and the GPS Window (the right side of the display). COM Window Active Frequency GPS Window Standby Frequency Data Field SECTION 1 INTRODUCTION Changing the standby communication frequency: Turn the large left knob to select the MHz, and the small left knob to select the kHz of the desired frequency. Placing the standby communication frequency in the active field: Press the COM Flip-flop Key (Figure 1-13). Figure 1-12 Standby Frequency 135.325 MHz Figure 1-13 Active Frequency 135.325 MHz After entering the active frequency, follow the preceding steps to enter the standby frequency. 190-00140-20 Rev. K GNC 420(A) Pilot's Guide and Reference 1-9