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TABLE OF CONTENTS SECTION 1: INTRODUCTION 1-1 1.1 Accessories and Packing List 1-1 1.2 Key and Knob Functions 1-2 1.3 Takeoff Tour 1-5 SECTION 2: COM 2-1 2.1 Communicating Using the GNC 420 2-1 SECTION 3: NAV PAGES 3-1 3.1 Main Page Groups 3-1 3.2 NAV Page Group 3-2 3.3 Default NAV Page 3-2 3.4 Map Page 3-5 3.5 TERRAIN Page 3-15 3.6 NAV...13-1 13.1 Messages 13-1 13.2 Abbreviations 13-8 13.3 Navigation Terms 13-11 Appendix A: Data Card Use A-1 Appendix B: Specifications B-1 Appendix C: Troubleshooting Q & A C-1 190-00140-20 Rev. K GNC 420(A) Pilot's Guide and Reference iii
TABLE OF CONTENTS SECTION 1: INTRODUCTION 1-1 1.1 Accessories and Packing List 1-1 1.2 Key and Knob Functions 1-2 1.3 Takeoff Tour 1-5 SECTION 2: COM 2-1 2.1 Communicating Using the GNC 420 2-1 SECTION 3: NAV PAGES 3-1 3.1 Main Page Groups 3-1 3.2 NAV Page Group 3-2 3.3 Default NAV Page 3-2 3.4 Map Page 3-5 3.5 TERRAIN Page 3-15 3.6 NAV...13-1 13.1 Messages 13-1 13.2 Abbreviations 13-8 13.3 Navigation Terms 13-11 Appendix A: Data Card Use A-1 Appendix B: Specifications B-1 Appendix C: Troubleshooting Q & A C-1 190-00140-20 Rev. K GNC 420(A) Pilot's Guide and Reference iii
Pilots Guide
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...Specifications section of this manual (Appendix B). NOTE: Unless otherwise specified within this device must accept any questions or would like additional information, please refer to change and may differ slightly from other NAVAIDs, visual sightings, charts, etc. To reduce the risk of the GNC 420... repairs or modifications could void both the GNC 420 and the GNC 420A models. CAUTION: The Garmin GNC 420 does not contain any discrepancies before continuing navigation. For safety purposes, always resolve any user-serviceable parts. K GNC 420(A) Pilot's Guide and Reference v It is...
...Specifications section of this manual (Appendix B). NOTE: Unless otherwise specified within this device must accept any questions or would like additional information, please refer to change and may differ slightly from other NAVAIDs, visual sightings, charts, etc. To reduce the risk of the GNC 420... repairs or modifications could void both the GNC 420 and the GNC 420A models. CAUTION: The Garmin GNC 420 does not contain any discrepancies before continuing navigation. For safety purposes, always resolve any user-serviceable parts. K GNC 420(A) Pilot's Guide and Reference v It is...
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...SPECIFIC LEGAL RIGHTS, WHICH MAY VARY FROM STATE TO STATE. Online Auction Purchases: Products purchased through online auctions are not accepted for warranty verification. Online auction confirmations are not eligible for warranty coverage. vi GNC 420(A) Pilot's Guide and Reference 190-00140-20 Rev. WARRANTY AVIATION LIMITED WARRANTY All Garmin...performed by the local in locating a Service Center near you, visit the Garmin Website at 'http://www.garmin.com' or contact Garmin Customer Service at Garmin in normal use. This warranty does not apply to: (i) cosmetic damage,...
...SPECIFIC LEGAL RIGHTS, WHICH MAY VARY FROM STATE TO STATE. Online Auction Purchases: Products purchased through online auctions are not accepted for warranty verification. Online auction confirmations are not eligible for warranty coverage. vi GNC 420(A) Pilot's Guide and Reference 190-00140-20 Rev. WARRANTY AVIATION LIMITED WARRANTY All Garmin...performed by the local in locating a Service Center near you, visit the Garmin Website at 'http://www.garmin.com' or contact Garmin Customer Service at Garmin in normal use. This warranty does not apply to: (i) cosmetic damage,...
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...available selections for airports and cities. K SECTION 3 NAV PAGES Map Setup Many of the GNC 420's functions are those with a runway longer than 8100 feet. allows configuration of special features which specifically relate to that page. Medium airports include those with approximate populations greater than 200,000 ...and/or selection of the Map Display to the Map Page. Table 3-4 lists the settings available for each information type. 3-10 GNC 420(A) Pilot's Guide and Reference 190-00140-20 Rev. Displaying the Map Page Menu: Press the MENU Key with a runway longer than 50,...
...available selections for airports and cities. K SECTION 3 NAV PAGES Map Setup Many of the GNC 420's functions are those with a runway longer than 8100 feet. allows configuration of special features which specifically relate to that page. Medium airports include those with approximate populations greater than 200,000 ...and/or selection of the Map Display to the Map Page. Table 3-4 lists the settings available for each information type. 3-10 GNC 420(A) Pilot's Guide and Reference 190-00140-20 Rev. Displaying the Map Page Menu: Press the MENU Key with a runway longer than 50,...
Pilots Guide
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... from the waypoints contained in the flight plan. By default, the last waypoint in the Jeppesen NavData Card. 'MSL' lets the pilot set a specific target altitude for any waypoint category: airport, VOR, NDB, intersection, or user waypoint. Press the ENT Key when finished. SECTION 3 NAV PAGES ...knob to select 'Before' or 'After', and press the ENT Key. Figure 3-53 Reference Distance Selected Figure 3-54 VS Profile Field Selected 3-26 GNC 420(A) Pilot's Guide and Reference 190-00140-20 Rev. To select a different waypoint, turn the large right knob to highlight the 'VS Profile' ...
... from the waypoints contained in the flight plan. By default, the last waypoint in the Jeppesen NavData Card. 'MSL' lets the pilot set a specific target altitude for any waypoint category: airport, VOR, NDB, intersection, or user waypoint. Press the ENT Key when finished. SECTION 3 NAV PAGES ...knob to select 'Before' or 'After', and press the ENT Key. Figure 3-53 Reference Distance Selected Figure 3-54 VS Profile Field Selected 3-26 GNC 420(A) Pilot's Guide and Reference 190-00140-20 Rev. To select a different waypoint, turn the large right knob to highlight the 'VS Profile' ...
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... waypoint. 2) Press the MENU Key, and select the 'Activate Leg?' K Activating a flight plan along a specific leg: 1) Press the small right knob to activate the cursor and turn the large right knob to remove the cursor. 5-10 GNC 420(A) Pilot's Guide and Reference 190-00140-20 Rev. highlighted, press the ENT Key. and press...
... waypoint. 2) Press the MENU Key, and select the 'Activate Leg?' K Activating a flight plan along a specific leg: 1) Press the small right knob to activate the cursor and turn the large right knob to remove the cursor. 5-10 GNC 420(A) Pilot's Guide and Reference 190-00140-20 Rev. highlighted, press the ENT Key. and press...
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... To Be Deleted Figure 5-35 Remove Waypoint Window 4) With 'Yes?' On the preceding page, options to remove the selected procedure. 5-14 GNC 420(A) Pilot's Guide and Reference 190-00140-20 Rev. Identifiers appear in light blue directly above the procedure's waypoints. 3) Press the CLR Key...the active flight plan. SECTION 5 FLIGHT PLANS Shortcuts A number of removing approaches, departures, and arrivals, and aid in selecting a specific flight plan leg for navigation guidance. Removing an approach, departure, or arrival using the CLR Key, as described below. This process may...
... To Be Deleted Figure 5-35 Remove Waypoint Window 4) With 'Yes?' On the preceding page, options to remove the selected procedure. 5-14 GNC 420(A) Pilot's Guide and Reference 190-00140-20 Rev. Identifiers appear in light blue directly above the procedure's waypoints. 3) Press the CLR Key...the active flight plan. SECTION 5 FLIGHT PLANS Shortcuts A number of removing approaches, departures, and arrivals, and aid in selecting a specific flight plan leg for navigation guidance. Removing an approach, departure, or arrival using the CLR Key, as described below. This process may...
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... for navigation guidance. Figure 5-36 Destination Waypoint Highlighted 2) Press the Direct-to Key twice to highlight the desired destination waypoint (Figure 5-36). K GNC 420(A) Pilot's Guide and Reference 5-15 Activating a specific leg of the flight plan is discussed previously in the Waypoint Page Group (Section 7.1). Figure 5-38 Procedure Header Highlighted Figure 5-37 Activate... to specify which allows the pilot to select the WPT Page Group. SECTION 5 FLIGHT PLANS The 'Activate Leg?' option is used not only to activate a specific point-to-point leg, but to Key.
... for navigation guidance. Figure 5-36 Destination Waypoint Highlighted 2) Press the Direct-to Key twice to highlight the desired destination waypoint (Figure 5-36). K GNC 420(A) Pilot's Guide and Reference 5-15 Activating a specific leg of the flight plan is discussed previously in the Waypoint Page Group (Section 7.1). Figure 5-38 Procedure Header Highlighted Figure 5-37 Activate... to specify which allows the pilot to select the WPT Page Group. SECTION 5 FLIGHT PLANS The 'Activate Leg?' option is used not only to activate a specific point-to-point leg, but to Key.
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... the inbound course to the FAF waypoint active. option. 6.2 Non-Precision Approach Operations The GNC 420 provides non-precision approach guidance using GPS. With 'Yes?' Approaches designed specifically for primary approach course guidance. Approaches may be flown 'as a supplemental aid for precision...full approach while still some distance away, enroute to highlight 'Activate Vector-To-Final?' (Figure 6-7) and press the ENT Key. K GNC 420(A) Pilot's Guide and Reference 6-3 Many non-precision approaches have 'GPS overlays' to intercept the final course, before reaching the FAF....
... the inbound course to the FAF waypoint active. option. 6.2 Non-Precision Approach Operations The GNC 420 provides non-precision approach guidance using GPS. With 'Yes?' Approaches designed specifically for primary approach course guidance. Approaches may be flown 'as a supplemental aid for precision...full approach while still some distance away, enroute to highlight 'Activate Vector-To-Final?' (Figure 6-7) and press the ENT Key. K GNC 420(A) Pilot's Guide and Reference 6-3 Many non-precision approaches have 'GPS overlays' to intercept the final course, before reaching the FAF....
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...' re-appears above the OBS Key as the GNC 420 returns to suspend mode. This is suspended. 190-00140-20 Rev. Refer to Figure 6-66 for the Palmdale VOR/DME RWY 25 approach includes a course from fix to altitude legs show the specific target altitude on the Active Flight Plan Page (Figure... Rwy 25 Figure 6-64 Active Flight Plan Page MISSED APPROACH Climb to 5000' outbound via PMD VOR R-282'. Course from fix to altitude leg. K GNC 420(A) Pilot's Guide and Reference 6-23
...' re-appears above the OBS Key as the GNC 420 returns to suspend mode. This is suspended. 190-00140-20 Rev. Refer to Figure 6-66 for the Palmdale VOR/DME RWY 25 approach includes a course from fix to altitude legs show the specific target altitude on the Active Flight Plan Page (Figure... Rwy 25 Figure 6-64 Active Flight Plan Page MISSED APPROACH Climb to 5000' outbound via PMD VOR R-282'. Course from fix to altitude leg. K GNC 420(A) Pilot's Guide and Reference 6-23
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.... 190-00140-20 Rev. • If the aircraft has entered an airspace, the message 'Inside Airspace' appears (Figure 8-28). K GNC 420(A) Pilot's Guide and Reference 8-11 The alert boundaries for an airspace listed on the Nearest Airspace Page (Figure 8-29). The Nearest Airspace ... and a time to entry (if applicable). By selecting any nearby airspace. Once an airspace alert message appears, detailed information concerning the specific airspace is provided on the Nearest Airspace Page: 1) Select the Nearest Airspace Page, using the steps outlined in Section 8.1 (Figure 8-...
.... 190-00140-20 Rev. • If the aircraft has entered an airspace, the message 'Inside Airspace' appears (Figure 8-28). K GNC 420(A) Pilot's Guide and Reference 8-11 The alert boundaries for an airspace listed on the Nearest Airspace Page (Figure 8-29). The Nearest Airspace ... and a time to entry (if applicable). By selecting any nearby airspace. Once an airspace alert message appears, detailed information concerning the specific airspace is provided on the Nearest Airspace Page: 1) Select the Nearest Airspace Page, using the steps outlined in Section 8.1 (Figure 8-...
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... appear once the timer expires and reappear each time the GNC 420 is displayed. Event-based messages do not use a timer, but also point-to-point between two 400/500-series Garmin units in some instances) fuel on board figures for the...specific date and time. 190-00140-20 Rev. This menu option computes true airspeed (TAS), based upon several environmental conditions, including indicated altitude (IND ALT), barometric pressure (BARO), and total air temperature (TAT; Fuel planning figures can perform depending upon the factors above and the calibrated airspeed (CAS). K GNC 420...
... appear once the timer expires and reappear each time the GNC 420 is displayed. Event-based messages do not use a timer, but also point-to-point between two 400/500-series Garmin units in some instances) fuel on board figures for the...specific date and time. 190-00140-20 Rev. This menu option computes true airspeed (TAS), based upon several environmental conditions, including indicated altitude (IND ALT), barometric pressure (BARO), and total air temperature (TAT; Fuel planning figures can perform depending upon the factors above and the calibrated airspeed (CAS). K GNC 420...
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... highlight the desired message field. SECTION 9 AUX PAGES Editing a scheduled message: 1) Select 'Scheduler' from the Flight Planning Page, using the steps described at a specific date and time. K GNC 420(A) Pilot's Guide and Reference 9-11 4) The flashing cursor moves to select. Press the ENT Key when finished. Turn the small right knob to the...
... highlight the desired message field. SECTION 9 AUX PAGES Editing a scheduled message: 1) Select 'Scheduler' from the Flight Planning Page, using the steps described at a specific date and time. K GNC 420(A) Pilot's Guide and Reference 9-11 4) The flashing cursor moves to select. Press the ENT Key when finished. Turn the small right knob to the...
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Use the small and large right knobs to determine sunrise and sunset times. Figure 9-46 Date Field Highlighted 9-18 GNC 420(A) Pilot's Guide and Reference 190-00140-20 Rev. Press the ENT Key when finished. 5) The flashing cursor moves to the date field (Figure 9-...and large right knobs to enter the time for specific information regarding RAIM protection limits, also refer to the arrival time field. Refer to Section 9.4 for which the pilot wants to determine sunrise and sunset times. Once calculations are complete, the GNC 420 displays one of the specified arrival date and ...
Use the small and large right knobs to determine sunrise and sunset times. Figure 9-46 Date Field Highlighted 9-18 GNC 420(A) Pilot's Guide and Reference 190-00140-20 Rev. Press the ENT Key when finished. 5) The flashing cursor moves to the date field (Figure 9-...and large right knobs to enter the time for specific information regarding RAIM protection limits, also refer to the arrival time field. Refer to Section 9.4 for which the pilot wants to determine sunrise and sunset times. Once calculations are complete, the GNC 420 displays one of the specified arrival date and ...
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...AVAILABLE' is generated on the TERRAIN Page (Figure 10-9). Figure 10-8: TERRAIN NOT AVAILABLE Display Figure 10-9: TERRAIN FAILED Display 10-8 GNC 420(A) Pilot's Guide and Reference 190-00140-20 Rev. When the GPS signal is re-established and the aircraft is within the database ... validity, hardware status, and GPS status. SECTION 10 TERRAIN TERRAIN Not Available Alert TERRAIN requires a 3-D GPS navigation solution along with specific vertical accuracy minimums. Should the navigation solution become degraded or if the aircraft is out of the database coverage area, the annunciation '...
...AVAILABLE' is generated on the TERRAIN Page (Figure 10-9). Figure 10-8: TERRAIN NOT AVAILABLE Display Figure 10-9: TERRAIN FAILED Display 10-8 GNC 420(A) Pilot's Guide and Reference 190-00140-20 Rev. When the GPS signal is re-established and the aircraft is within the database ... validity, hardware status, and GPS status. SECTION 10 TERRAIN TERRAIN Not Available Alert TERRAIN requires a 3-D GPS navigation solution along with specific vertical accuracy minimums. Should the navigation solution become degraded or if the aircraft is out of the database coverage area, the annunciation '...
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... the active flight plan to use as the reference point for the request. ♦ From Lat/Lon - Request NEXRAD data from a specific latitude and longitude. Request NEXRAD data from a specific waypoint identifier. K GNC 420(A) Pilot's Guide and Reference 11-21 The following userselectable fields: • Center - The 'WPT' field is displayed. Request NEXRAD data...
... the active flight plan to use as the reference point for the request. ♦ From Lat/Lon - Request NEXRAD data from a specific latitude and longitude. Request NEXRAD data from a specific waypoint identifier. K GNC 420(A) Pilot's Guide and Reference 11-21 The following userselectable fields: • Center - The 'WPT' field is displayed. Request NEXRAD data...
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... NEXRAD Received • New Graphic METAR Received • New Text METAR Received 11-22 GNC 420(A) Pilot's Guide and Reference 190-00140-20 Rev. After panning and selecting a position on by setting it to request NEXRAD data at a specific map position. The time options are OFF, 10 min, 15 min, 20 min, 30...
... NEXRAD Received • New Graphic METAR Received • New Text METAR Received 11-22 GNC 420(A) Pilot's Guide and Reference 190-00140-20 Rev. After panning and selecting a position on by setting it to request NEXRAD data at a specific map position. The time options are OFF, 10 min, 15 min, 20 min, 30...
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...8226; Request NEXRAD? • Request METAR? • View Text METAR? (if available) Figure 11-36 Map Page Options Menu NOTE: If the GNC 420 is available for Weather Data Link Interface with a GDL 49 or GDL 69, pressing the CLR Key while viewing the Map Page reduces the NEXRAD...is pressed while density is displayed, enter the identifier for a specific airport from the Map Page. Request Shortcuts The pilot can quickly select the NEXRAD, METAR, or Textual METAR Page for the desired airport. and 'Request METAR?' K GNC 420(A) Pilot's Guide and Reference 11-25 fields in the Page Menu...
...8226; Request NEXRAD? • Request METAR? • View Text METAR? (if available) Figure 11-36 Map Page Options Menu NOTE: If the GNC 420 is available for Weather Data Link Interface with a GDL 49 or GDL 69, pressing the CLR Key while viewing the Map Page reduces the NEXRAD...is pressed while density is displayed, enter the identifier for a specific airport from the Map Page. Request Shortcuts The pilot can quickly select the NEXRAD, METAR, or Textual METAR Page for the desired airport. and 'Request METAR?' K GNC 420(A) Pilot's Guide and Reference 11-25 fields in the Page Menu...
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...updates. or 'Update Request?' The Data Link Page is only selectable when an active Flight Plan has been selected. This is displayed. 11-28 GNC 420(A) Pilot's Guide and Reference 190-00140-20 Rev. The 'Flight Plan' field (displayed in the active flight plan to use as opposed to... Select 'Manual Send?' SECTION 11 ADDITIONAL FEATURES NOTE: Textual METARs can only be edited. ♦ From Flight Plan - Request METAR data from a specific latitude and longitude. Request NEXRAD data from the map. The 'WPT' field is the ID selected from the NEXRAD Request Page, press the small right...
...updates. or 'Update Request?' The Data Link Page is only selectable when an active Flight Plan has been selected. This is displayed. 11-28 GNC 420(A) Pilot's Guide and Reference 190-00140-20 Rev. The 'Flight Plan' field (displayed in the active flight plan to use as opposed to... Select 'Manual Send?' SECTION 11 ADDITIONAL FEATURES NOTE: Textual METARs can only be edited. ♦ From Flight Plan - Request METAR data from a specific latitude and longitude. Request NEXRAD data from the map. The 'WPT' field is the ID selected from the NEXRAD Request Page, press the small right...
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... time of desired METAR Data and the desired radius (graphical requests only). 5) Select 'Manual Send?' The request has been sent. and press the ENT Key. K GNC 420(A) Pilot's Guide and Reference 11-29 The METAR Request Page is displayed (Figure 11-44). Displaying graphical METARs on the NAV Weather Page. The Map... the Map Page. 2) Move the target pointer to highlight a desired airport. Note that airport in a thumbnail image. or 'Update Request?' Viewing graphical METAR Data for a specific airport from the Map Page: 1) Select the Map Page. 2) Press the MENU Key.
... time of desired METAR Data and the desired radius (graphical requests only). 5) Select 'Manual Send?' The request has been sent. and press the ENT Key. K GNC 420(A) Pilot's Guide and Reference 11-29 The METAR Request Page is displayed (Figure 11-44). Displaying graphical METARs on the NAV Weather Page. The Map... the Map Page. 2) Move the target pointer to highlight a desired airport. Note that airport in a thumbnail image. or 'Update Request?' Viewing graphical METAR Data for a specific airport from the Map Page: 1) Select the Map Page. 2) Press the MENU Key.