Garmin GNC 420 Quick Reference
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Garmin GNC 420 Quick Reference

Garmin GNC 420 Quick Reference

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GNC 420/420A
Quick Reference

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Summary of Contents for Garmin GNC 420

  • Page 1 GNC 420/420A Quick Reference...

  • Page 2: Left-Hand Keys And Knobs

    KEYS AND KNOBS COM Power/ Volume COM Flip-flop CLR (clear) Direct-to RNG (map range) MENU Left-hANd Keys ANd KNobs The COM Power/Volume Knob controls unit power and communications radio volume. Press momentarily to disable automatic squelch control. The large left knob is used to tune the megahertz (MHz) value of the standby frequency for the COM transceiver.

  • Page 3: Right-Hand Keys And Knobs

    RiGht-hANd Keys ANd KNobs The RNG Key allows the pilot to select the desired map range. Press the up arrow to zoom out to a larger area, or the down arrow to zoom in to a smaller area. The Direct-to Key provides access to the direct-to function, which allows the pilot to enter a destination waypoint and establishes a direct course to the selected destination.
  • Page 4 POWER ON Once the self-test concludes, the Database Versions Page appears which shows the current database information on the NavData® Card and Terrain Data cards. Press the ENT Key to acknowledge the Database Page and proceed to the Instrument Panel Self-test Page. The Instrument Panel Self-test Page allows the pilot to verify that the GNC 420 is communicating properly with in-panel...

  • Page 5: Frequency Selection

    Selecting a frequency: Turn the large left knob to select the desired megahertz (MHz) value. For example, the ‘135’ portion of the frequency ‘135.325’. Turn the small left knob to select the desired kilohertz (kHz) value. For example, the ‘.325’ portion of the frequency ‘135.325’.
  • Page 6 MAIN PAGE GROUPS mAiN PAGe GRoUPs The GNC 420’ s main pages are divided into four separate page groups: NAV, WPT, AUX, and NRST. Each page group is comprised of multiple pages. The page groups are selected using the large right knob. The individual pages are selected using the small right knob.

  • Page 7: Direct-To Navigation

    AUX PAGe GRoUP The AUX Page Group includes four pages. Flight Planning Utility Setup 1 Setup 2 NOTE: The flight plan pages are selected by pressing the FPL Key and using the small right knob to select the desired page. NRst PAGe GRoUP The NRST Page Group includes eight pages.
  • Page 8 DIRECT-TO NAVIGATION Selecting a direct-to destination from the Map Page: Select the Map Page from the NAV Page Group. Press the small right knob to display a panning pointer. Turn the small and large right knobs to place the panning pointer at the desired destination location.
  • Page 9 Selecting a nearby airport or a flight plan waypoint as a direct-to destination: Press the Direct-to Key. Turn the large right knob to highlight the nearest airport (NRST) or flight plan (FPL) field. Turn the small right knob to display a window listing nearby airports or all waypoints in the active flight plan.
  • Page 10 VIEWING AIRPORT INFORMATION Viewing airport information by facility name or city: Select the Airport Location Page (see page 6). Press the small right knob to activate the cursor. Turn the large right knob to highlight the facility name (second line) or the city (third line) field.

  • Page 11: Default Nav Page

    defAULt NAV PAGe TO/FROM Flag Course Deviation Indicator (CDI) Active Leg of Flight Plan User-selectable Data Fields The following symbols are used on the Default NAV Page (directly below the CDI), to depict the ‘active leg’ of a flight plan or direct to: Direct-to a Waypoint Course to a Waypoint, or Desired Course between Two Waypoints...
  • Page 12 MAP PAGE Turn the small right knob to display the list of available data items. Continue turning the small right knob to select the desired data item from the list. Press the ENT Key to select the desired data item and return to the Default NAV Page. Press the small right knob momentarily to remove the cursor from the page.

  • Page 13: Full Screen Map

    Selecting a different data item for any data field: With Map Page displayed, press the MENU Key to display an options menu. Turn the large right knob to highlight ‘Change Fields?’ and press the ENT Key. Turn the large right knob to highlight the data field to be changed.

  • Page 14: Navcom Page

    NAVCOM PAGE Inhibiting TERRAIN: Select the TERRAIN Page and press the MENU Key. ‘Inhibit Terrain?’ is selected by default. Press the ENT Key. The ‘TER INHB’ annunciation is displayed in the TERRAIN annunciator field when TERRAIN is inhibited. Annunciator Field NOTE: Inhibit mode deactivates TERRAIN alerting when deemed unnecessary by the pilot.

  • Page 15: Nearest Airports

    Scrolling through the list of frequencies: Activate the cursor, if not already active, by pressing the small right knob. Turn the large right knob to move the cursor through the list of frequencies. If there are more frequencies in the list than can be displayed on the screen, a scroll bar along the right-hand side of the screen indicates which part of the list is currently being displayed.
  • Page 16 NEARBY AIRPORTS Viewing additional information for a nearby airport: Highlight the identifier of the desired airport by scrolling through the list, as described in the preceding procedure. Press the ENT Key to display the Airport Location Page for the selected airport. To view additional WPT pages for the selected airport (including the airport runway and airport frequency pages), press the small right...

  • Page 17: Flight Plans

    Creating a new flight plan: Press the FPL Key and turn the small right knob to display the Flight Plan Catalog Page. Press the MENU Key to display the Flight Plan Catalog Page Menu. Turn the large right knob to highlight ‘Create New Flight Plan?’...
  • Page 18 SELECT AN APPROACH Editing a flight plan: Press the FPL Key and turn the small right knob to display the Flight Plan Catalog Page. Press the small right knob to activate the cursor. Turn the large right knob to highlight the desired flight plan and press the ENT Key.
  • Page 19 Turn the large right knob to highlight ‘Load?’ or ‘Activate?’ and press the ENT Key. (‘Load?’ adds the procedure to the flight plan without immediately using it for navigation guidance. This allows the pilot to continue navigating the original flight plan, but keeps the procedure available on the Active Flight Plan Page for quick activation when needed.) For precision approaches and some non-...

  • Page 20: Flying An Approach

    FLYING AN APPROACH Activating the approach with vectors to final: With an approach loaded in the active flight plan, press the PROC Key to display the Procedures Page. Turn the large right knob to highlight ‘Activate Vector-To-Final?’ and press the ENT Key. GUideLiNes foR fLyiNG AN APPRoACh Due to the variety of available approach procedures, the specific steps required will vary according to the...

  • Page 21: Flying The Missed Approach

    • A ‘START PROC TRN’ prompt will appear in the lower right corner of the display to advise the pilot when the aircraft is at a safe distance to initiate a procedure turn. The procedure turn is displayed on the Map Page, but guidance through the turn itself is not provided.
  • Page 22 Hounsdown Business Park Southampton, SO40 9RB, U.K. p: +44/ (0) 870.8501241 f: +44/ (0) 870.8501251 Garmin Corporation No. 68, Jangshu 2nd Road Shijr, Taipei County, Taiwan p: 886/2.2642.9199 f: 886/2.2642.9099 www.garmin.com © 2008 Garmin Ltd. or its subsidiaries 190-00140-21 Rev. F...

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Gnc 420a

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