Garmin G500 Manual
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vii190-01102-02 Rev. DGarmin G500 Pilot’s Guide
ForewardSec 1
System Sec 2
PFD Sec 3
MFD Sec 4
Hazard
Avoidance
Sec 5
Additional Features Sec 6
Annun.
& Alerts Sec 7
Symbols Sec 8
Glossary Appendix A Appendix B
Index
Contents
1 System Overview ........................................................................\
......... 1-1
1.1 System Description ........................................................................\
........ 1-1
1.1.1 Line Replaceable Units (LRU)...](http://img.usermanuals.tech/thumb/27/104965/w64_g500-manual-1526480341_d-8.png "Page 9
vii190-01102-02 Rev. DGarmin G500 Pilot’s Guide
ForewardSec 1
System Sec 2
PFD Sec 3
MFD Sec 4
Hazard
Avoidance
Sec 5
Additional Features Sec 6
Annun.
& Alerts Sec 7
Symbols Sec 8
Glossary Appendix A Appendix B
Index
Contents
1 System Overview ........................................................................\
......... 1-1
1.1 System Description ........................................................................\
........ 1-1
1.1.1 Line Replaceable Units (LRU)...")
![Page 10
viiiGarmin G500 Pilot’s Guide190-01102-02 Rev. D
Foreword
Sec 1
System
Sec 2
PFD
Sec 3
MFD
Sec 4
Hazard
Avoidance
Sec 5
Additional Features
Sec 6
Annun.
& Alerts
Sec 7
Symbols
Sec 8
Glossary
Appendix A
Appendix B
Index
2.3.1 Extreme Attitude ................................................................. 2-10
2.4 Altimeter ........................................................................\
.................... 2-12
2.4.1 Setting the Altitude Bug and Alerter...](http://img.usermanuals.tech/thumb/27/104965/w64_g500-manual-1526480341_d-9.png "Page 10
viiiGarmin G500 Pilot’s Guide190-01102-02 Rev. D
Foreword
Sec 1
System
Sec 2
PFD
Sec 3
MFD
Sec 4
Hazard
Avoidance
Sec 5
Additional Features
Sec 6
Annun.
& Alerts
Sec 7
Symbols
Sec 8
Glossary
Appendix A
Appendix B
Index
2.3.1 Extreme Attitude ................................................................. 2-10
2.4 Altimeter ........................................................................\
.................... 2-12
2.4.1 Setting the Altitude Bug and Alerter...")
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xiiGarmin G500 Pilot’s Guide190-01102-02 Rev. D
Foreword
Sec 1
System
Sec 2
PFD
Sec 3
MFD
Sec 4
Hazard
Avoidance
Sec 5
Additional Features
Sec 6
Annun.
& Alerts
Sec 7
Symbols
Sec 8
Glossary
Appendix A
Appendix B
Index
4.9.5.4 Hail ........................................................................\
............. 4-73
4.9.6 Radar Operation in Weather Mode .......................................4-74
4.9.6.1 Displaying Weather on the Weather Radar Page ...................4-75
4.9.6.2...](http://img.usermanuals.tech/thumb/27/104965/w64_g500-manual-1526480341_d-13.png "Page 14
xiiGarmin G500 Pilot’s Guide190-01102-02 Rev. D
Foreword
Sec 1
System
Sec 2
PFD
Sec 3
MFD
Sec 4
Hazard
Avoidance
Sec 5
Additional Features
Sec 6
Annun.
& Alerts
Sec 7
Symbols
Sec 8
Glossary
Appendix A
Appendix B
Index
4.9.5.4 Hail ........................................................................\
............. 4-73
4.9.6 Radar Operation in Weather Mode .......................................4-74
4.9.6.1 Displaying Weather on the Weather Radar Page ...................4-75
4.9.6.2...")
ix190-01102-02 Rev. DGarmin G500 Pilot’s Guide ForewardSec 1 System Sec 2 PFD Sec 3 MFD Sec 4 Hazard Avoidance Sec 5 Additional Features Sec 6 Annun. & Alerts Sec 7 Symbols Sec 8 Glossary Appendix A Appendix B Index 3.3.10.3 Traffic Feature Options (Optional) .........................................3-30 3.3.10.4 Aviation Feature Options ..................................................... 3-31 3.3.11 Split Screen (Optional) ......................................................... 3-42 3.4 Aux Mode Pages ........................................................................\ ......... 3-43 3.4.1 System Settings ................................................................... 3-43 3.4.1.1 Display Brightness ............................................................... 3-44 3.4.1.2 Airspeed Reference Marks ................................................... 3-45 3.4.1.3 PFD Options - Wind Vector ................................................... 3-46 3.4.1.4 Synchronization (Dual Installations Only) ..............................3-47 3.4.1.5 Date and Time ..................................................................... 3-49 3.4.1.6 MFD Display Units ............................................................... 3-50 3.4.1.7 System Display Units ........................................................... 3-51 3.4.2 XM Information (Optional) ................................................... 3-52 3.4.3 XM Entertainment Radio (Optional) .....................................3-53 3.4.4 System Status ...................................................................... 3-54 3.4.5 External Video (optional) ...................................................... 3-55 3.4.5.1 Select Video Source ............................................................. 3-55 3.4.5.2 Zoom ........................................................................\ .......... 3-56 3.4.5.3 Panning ........................................................................\ ...... 3-56 3.4.5.4 Setup ........................................................................\ .......... 3-56 3.4.5.5 Restore Defaults .................................................................. 3-58 3.4.6 Position Reporting (optional) ............................................... 3-59 3.4.6.1 Status ........................................................................\ ......... 3-59 3.4.6.2 Report Type ........................................................................\ . 3-59 3.4.7 Iridium Phone Operation (Optional) ......................................3-62 3.4.7.1 Status ........................................................................\ ......... 3-62 3.4.7.2 Managing the Phone Book .................................................. 3-64 3.4.7.3 Phone Volume ..................................................................... 3-67 3.4.7.4 Making a Phone Call ........................................................... 3-68 3.4.7.5 Answering a Phone Call ...................................................... 3-69 3.5 Flight Plan Pages ........................................................................\ ........ 3-70 3.5.1 Active Flight Plan Page ........................................................ 3-70 3.5.1.1 Active Flight Plan Detail ....................................................... 3-71 3.5.1.2 Active Flight Plan Options .................................................... 3-71 3.5.1.3 Setting the Altitude Minimums Alerter ..................................3-72 3.5.2 Waypoint Information Page ................................................. 3-73 3.5.2.1 Selecting a Waypoint ........................................................... 3-74 3.5.2.2 Waypoint Information Detail ................................................ 3-75
xGarmin G500 Pilot’s Guide190-01102-02 Rev. D Foreword Sec 1 System Sec 2 PFD Sec 3 MFD Sec 4 Hazard Avoidance Sec 5 Additional Features Sec 6 Annun. & Alerts Sec 7 Symbols Sec 8 Glossary Appendix A Appendix B Index 3.5.2.3 Airport Directory .................................................................. 3-78 3.5.2.4 Waypoint Weather Information (Optional) ............................3-79 3.5.3 Charts Page (Optional) ........................................................ 3-80 3.5.3.1 Viewing Charts .................................................................... 3-81 3.5.3.2 Selecting a New Chart by Airport .........................................3-82 3.5.3.3 Selecting a New Chart by FPL, NRST, or RECENT ...................3-83 3.5.3.4 Change Day/Night View ....................................................... 3-83 4 Hazard Avoidance ........................................................................\ ........ 4-1 4.1 Terrain Configurations ........................................................................\ ... 4-1 4.2 Terrain Scale ........................................................................\ ................. 4-3 4.3 Terrain Proximity ........................................................................\ ........... 4-3 4.3.1 Displaying Terrain Proximity ................................................... 4-4 4.3.1.1 Terrain Proximity Page Display on the Terrain Page .................4-4 4.3.1.2 Terrain Proximity Page Display on a Navigation Map Page ......4-5 4.3.1.3 Terrain Proximity Page 120° Arc or 360° Rings .......................4-5 4.3.1.4 Terrain Proximity Page Aviation Data ......................................4-6 4.3.2 Terrain Proximity Limitations .................................................. 4-8 4.3.3 System Status ........................................................................\ 4-8 4.4 External TAWS ........................................................................\ .............. 4-9 4.5 Garmin Terrain-SVT™ (Optional) ......................................................... 4-10 4.5.1.1 Garmin Terrain-SVT™ Page 120° Arc or 360° Rings .............4-11 4.5.1.2 Garmin Terrain-SVT™ Page Aviation Data ............................4-12 4.5.1.3 Inhibiting/Enabling Garmin Terrain-SVT™ Alerting ...............4-12 4.5.1.4 Synthetic Vision Alerts and Annunciations .............................4-13 4.6 TAS Traffic (Optional) ........................................................................\ ... 4-15 4.6.1 Displaying and Operating Traffic (TAS Systems) .....................4-15 4.6.1.1 Switching from Standby Mode to Operating Modes ..............4-16 4.6.1.2 Range Ring ........................................................................\ . 4-17 4.6.2 Altitude Display ................................................................... 4-17 4.6.3 TAS Symbology .................................................................... 4-18 4.6.4 Traffic System Status ............................................................ 4-19 4.6.5 Traffic Pop-Up ...................................................................... 4-21 4.7 TIS Traffic (Optional) ........................................................................\ .... 4-22 4.7.1 Traffic Map Page .................................................................. 4-22 4.7.2 TIS Symbology ..................................................................... 4-24 4.7.3 TIS Limitations ..................................................................... 4-25 4.7.4 TIS Alerts ........................................................................\ ..... 4-27
xi190-01102-02 Rev. DGarmin G500 Pilot’s Guide ForewardSec 1 System Sec 2 PFD Sec 3 MFD Sec 4 Hazard Avoidance Sec 5 Additional Features Sec 6 Annun. & Alerts Sec 7 Symbols Sec 8 Glossary Appendix A Appendix B Index 4.7.5 Traffic Pop-Up ...................................................................... 4-28 4.7.6 TIS System Status ................................................................ 4-28 4.8 XM Weather (Optional) ....................................................................... 4-31 4.8.1 Using XM Satellite Weather Products ...................................4-31 4.8.2 Customizing the XM Weather Map ......................................4-31 4.8.3 XM Weather Symbols and Product Age ................................4-34 4.8.4 Weather Legends ................................................................ 4-36 4.8.5 NEXRAD ........................................................................\ ..... 4-37 4.8.5.1 Reflectivity ........................................................................\ .. 4-38 4.8.5.2 NEXRAD Limitations ............................................................ 4-39 4.8.6 Weather Page Map Orientation ............................................4-40 4.8.7 NEXRAD Data Viewing Range .............................................. 4-40 4.8.8 NEXRAD Legend .................................................................. 4-41 4.8.9 Echo Tops ........................................................................\ .... 4-42 4.8.10 Cloud Tops ........................................................................\ .. 4-44 4.8.11 XM Lightning ...................................................................... 4-46 4.8.12 Cell Movement .................................................................... 4-47 4.8.13 SIGMETs and AIRMETs ........................................................ 4-49 4.8.14 METARs ........................................................................\ ...... 4-51 4.8.15 Surface Analysis and City Forecast ........................................4-53 4.8.16 Freezing Level ...................................................................... 4-56 4.8.17 Winds Aloft ........................................................................\ . 4-58 4.8.18 County Warnings ................................................................. 4-61 4.9 Weather Radar (Optional) ................................................................... 4-63 4.9.1 Garmin GWX 68 Radar Description ......................................4-63 4.9.1.1 Principles of Pulsed Airborne Weather Radar ........................4-63 4.9.1.2 Antenna Beam Illumination ................................................. 4-64 4.9.1.3 Radar Signal Attenuation ..................................................... 4-65 4.9.2 Radar Signal Reflectivity ...................................................... 4-66 4.9.2.1 Precipitation ........................................................................\ 4-66 4.9.2.2 Ground Returns ................................................................... 4-67 4.9.2.3 Angle of Incidence ............................................................... 4-67 4.9.3 Operating Distance .............................................................. 4-68 4.9.4 Basic Antenna Tilt Setup ...................................................... 4-69 4.9.5 Weather Mapping and Interpretation ...................................4-70 4.9.5.1 Weather display Interpretation .............................................4-70 4.9.5.2 Thunderstorms .................................................................... 4-71 4.9.5.3 Tornadoes ........................................................................\ ... 4-73
xiiGarmin G500 Pilot’s Guide190-01102-02 Rev. D Foreword Sec 1 System Sec 2 PFD Sec 3 MFD Sec 4 Hazard Avoidance Sec 5 Additional Features Sec 6 Annun. & Alerts Sec 7 Symbols Sec 8 Glossary Appendix A Appendix B Index 4.9.5.4 Hail ........................................................................\ ............. 4-73 4.9.6 Radar Operation in Weather Mode .......................................4-74 4.9.6.1 Displaying Weather on the Weather Radar Page ...................4-75 4.9.6.2 Vertically Scanning a Storm Cell ...........................................4-76 4.9.6.3 Adjusting the Antenna Tilt Angle ..........................................4-77 4.9.6.4 Adjusting Gain .................................................................... 4-78 4.8.6.5 Sector Scan (GWX Radars Only) ...........................................4-80 4.9.6.6 Antenna Stabilization .......................................................... 4-81 4.9.6.7 Weather Attenuated Color Highlight (WATCH™) .................4-81 4.9.6.8 Weather Alert (GWX Radars Only) ........................................4-82 4.9.7 Ground Mapping and Interpretation ....................................4-83 4.10 GFDS Weather (Optional) .................................................................... 4-85 4.10.1 Using GFDS Satellite Weather Products ................................4-86 4.10.2 Register With GFDS ............................................................. 4-86 4.10.2.1 Register With GFDS ............................................................. 4-86 4.10.2.2 Deactivate Unit Registration With GFDS ...............................4-87 4.10.3 Customizing the GFDS Weather Map ...................................4-88 4.10.4 Weather Page Map Orientation ............................................4-90 4.10.5 GFDS Data Request ............................................................. 4-91 4.10.5.1 GFDS Data Request Coverage .............................................. 4-92 4.10.5.2 GFDS Data Request Auto Request ........................................4-94 4.10.5.3 GFDS Data Request Manual Request ....................................4-94 4.10.5.4 GFDS Data Request Status Window .....................................4-95 4.10.6 Precipitation (PRECIP) Data Viewing Range ..........................4-96 4.10.7 PRECIP Legend .................................................................... 4-97 4.10.8 GFDS Infrared Satellite (IR SAT) Data Viewing Range ............4-98 4.10.9 Data Link Lightning (DL LTNG) Data Viewing Range ............4-100 4.10.10 SIGMETs and AIRMETs (SIG/AIR) ........................................4-102 4.10.11 METARs ........................................................................\ .... 4-105 4.10.12 Winds Aloft ....................................................................... 4-107 5 Additional Features (Optional) ............................................................ 5-1 5.1 Viewing Charts ........................................................................\ ............. 5-2 5.1.1 Chart Panning ....................................................................... 5-3 5.1.2 Choosing a Chart for the Current Airport ................................5-4 5.1.3 Selecting a Chart by Identifier ................................................ 5-6 5.1.4 Selecting a New Chart by FPL, NRST , or RECENT ..................... 5-7 5.1.5 Charts Menu Selections ......................................................... 5-8
xiii190-01102-02 Rev. DGarmin G500 Pilot’s Guide ForewardSec 1 System Sec 2 PFD Sec 3 MFD Sec 4 Hazard Avoidance Sec 5 Additional Features Sec 6 Annun. & Alerts Sec 7 Symbols Sec 8 Glossary Appendix A Appendix B Index 5.1.5.1 Setting the Altitude Minimums Alerter ....................................5-8 5.1.5.2 Viewing Chart NOTAMs ......................................................... 5-9 5.1.5.3 Day/Night View ..................................................................... 5-9 5.2 ChartView (Optional) ........................................................................\ .. 5-10 5.2.1 Cycle Number and Revision ................................................. 5-11 5.2.2 Viewing Chart Details in ChartView .....................................5-13 5.3 FliteCharts ® ........................................................................\ ............... 5-16 5.3.1 Cycle Number and Revision ................................................. 5-16 5.4 SafeTaxi ® ........................................................................\ .................. 5-18 5.4.1 Using SafeTaxi ® ................................................................. 5-19 5.4.1.1 Decluttering ........................................................................\ 5-19 5.4.1.2 Hot Spot Information ........................................................... 5-19 5.4.2 SafeTaxi ® Cycle Number and Revision ..................................5-20 5.5 XM ® Radio Entertainment .................................................................. 5-22 5.5.1 Activating XM ® Satellite Radio Services ................................5-22 5.5.2 XM ® Information ................................................................. 5-24 5.5.3 XM ® Entertainment Radio ................................................... 5-25 5.5.3.1 Channel Categories ............................................................. 5-26 5.5.3.2 Selecting an XM ® Radio Channel ......................................... 5-27 5.5.3.3 XM ® Radio Volume .............................................................. 5-28 5.5.3.4 XM ® Radio Channel Presets ................................................. 5-29 5.5.4 GDL 69/69A Data Link Receiver Troubleshooting ..................5-30 5.6 Autopilot Operation ........................................................................\ .... 5-31 5.6.1 Autopilot Test ...................................................................... 5-31 5.6.2 Heading ........................................................................\ ...... 5-32 5.6.3 Altitude Capture (Optional Interface) ...................................5-32 5.6.4 Autopilot Navigation ........................................................... 5-33 5.6.4.1 Autopilot Operation with GPSS Enabled Autopilots ...............5-33 5.6.3.2 Autopilot Operation with the GDU 620 Emulating GPSS .......5-34 5.6.4 Flight Director Display .......................................................... 5-35 5.7 Garmin Synthetic Vision Technology (SVT™) (Optional) ........................5-36 5.7.1 Garmin SVT™ Operation ..................................................... 5-38 5.7.2 Activating and Deactivating Garmin SVT™ ..........................5-39 5.7.3 Garmin SVT™ Features ....................................................... 5-40 5.7.3.1 Flight Path Marker (FPM) ..................................................... 5-40 5.7.3.2 Zero-Pitch Line .................................................................... 5-40 5.7.3.3 Horizon Heading ................................................................. 5-41
xivGarmin G500 Pilot’s Guide190-01102-02 Rev. D Foreword Sec 1 System Sec 2 PFD Sec 3 MFD Sec 4 Hazard Avoidance Sec 5 Additional Features Sec 6 Annun. & Alerts Sec 7 Symbols Sec 8 Glossary Appendix A Appendix B Index 5.7.3.4 Airport Signs ....................................................................... 5-41 5.7.3.5 Runway Depiction ............................................................... 5-42 5.7.3.6 Traffic ........................................................................\ .......... 5-43 5.7.3.7 Obstacles ........................................................................\ .... 5-44 5.7.3.8 Field of View ....................................................................... 5-45 5.7.3.9 Unusual Attitudes ................................................................ 5-47 6 Annunciations and Alerts ..................................................................... 6-1 6.1 Alerts ........................................................................\ ........................... 6-1 6.2 System Status ........................................................................\ ............... 6-9 7 Symbols ........................................................................\ ........................ 7-1 7.1 Map Page Symbols ........................................................................\ ........ 7-1 7.2 SafeTaxi ™ Symbols ........................................................................\ ..... 7-2 7.3 Traffic Symbols ........................................................................\ .............. 7-2 7.4 Terrain Obstacle Symbols ....................................................................... 7-3 7.5 Basemap Symbols ........................................................................\ ......... 7-4 7.6 Map Tool Bar Symbols ........................................................................\ ... 7-4 7.7 XM Weather Tool Bar Symbols ............................................................... 7-5 7.8 Miscellaneous Symbols ........................................................................\ .. 7-6 8 Glossary ........................................................................\ ....................... 8-1 Appendix A ........................................................................\ ......................... A-1 SD Card Use and Databases ........................................................................\ .. A-1 Jeppesen Databases ........................................................................\ ....... A-2 Updating the Jeppesen Aviation Database ..............................................A-2 Garmin Databases ........................................................................\ .......... A-4 Updating Garmin databases ................................................................... A-5 Index ........................................................................\ ................................... B-1
1-1190-01102-02 Rev. DGarmin G500 Pilot’s Guide ForewordSec 1 System Sec 2 PFD Sec 3 MFD Sec 4 Hazard Avoidance Sec 5 Additional Features Sec 6 Annun. & Alerts Sec 7 Symbols Sec 8 Glossary Appendix A Appendix B Index 1 SyStem Overview 1.1 System Description This section provides an overview of the G500 Avionics Display System. The G500 system is an integrated display system that presents primary flight instrumentation, navigation, and a moving map to the pilot through large- format displays. In normal operating mode, the Primary Flight Display (PFD) presents graphical flight instrumentation (attitude, heading, airspeed, altitude, vertical speed), replacing the traditional flight instrument cluster. The Multi-Function Display (MFD) normally displays a full-color moving map with navigation information, as well as supplemental data. TrafficAudio Panel SL 30ADF GDL 69/69AGTX330/330DAutopilot Flight Director GAD 43GWX 68 GMU 44 Magnetometer GPS Navigator(s) Temperature Probe GRS 77 AHRS GDC 74 Air Data Computer GDU 620 Optional Interfaces Figure 1-1 G500 System (LRU Configuration) The system consists of the following Line Replaceable Units (LRUs): • GDU 620 Primary Flight Display (PFD) and Multi Function Display (MFD) • GDC 74AAir Data Computer (ADC) • GRS 77 Attitude and Heading Reference System (AHRS)
1-2Garmin G500 Pilot’s Guide190-01102-02 Rev. D Foreword Sec 1 System Sec 2 PFD Sec 3 MFD Sec 4 Hazard Avoidance Sec 5 Additional Features Sec 6 Annun. & Alerts Sec 7 Symbols Sec 8 Glossary Appendix A Appendix B Index • GNS 480, CNX80, GNS 400W series, or GNS 500W series, or a compatible GPS Navigator • Temperature Probe (such as the GTP 59) • GMU 44 Magnetometer • GDL 69/69A Satellite Data Link Receiver (optional) • GSR 56 Satellite Data Link Receiver (optional) • SL30 NavCom (optional) • Autopilot/Flight Director (optional) • ADF (optional) • Garmin GTS or GTX traffic awareness systems, or selected 3rd party devices (optional) • Audio Panel (optional) • GAD 43 Adapter (optional) • Garmin GWX systems or selected 3rd party radar (optional) 1.1.1 Line Replaceable Units (LRU) This guide covers the operation of the GDU 620 display as integrated in the G500 system. The G500 Avionics Display System is an avionics suite designed to replace the traditional flight instrument cluster. The system combines primary flight instrumentation, navigational information, and a moving map all displayed on dual color screens. The G500 system is composed of sub-units or Line Replaceable Units (LRUs). LRUs have a modular design and can be installed directly behind the instrument panel or in a separate avionics bay if desired. This design greatly eases troubleshooting and maintenance of the G500 system. A failure or problem can be isolated to a particular LRU, which can be replaced quickly and easily. Each LRU has a particular function, or set of functions, that contributes to the system’s operation.
1-3190-01102-02 Rev. DGarmin G500 Pilot’s Guide ForewordSec 1 System Sec 2 PFD Sec 3 MFD Sec 4 Hazard Avoidance Sec 5 Additional Features Sec 6 Annun. & Alerts Sec 7 Symbols Sec 8 Glossary Appendix A Appendix B Index 1.1.2 GDU 620 The GDU 620 has dual VGA (640 x 480 pixels) 6.5 inch LCD displays. The left side of the GDU is a PFD and the right side is the MFD. In some models or installations, the PFD and MFD and their controls are switched to the other side. The MFD shows a moving map, flight plan, weather, and other supplemental data. The PFD shows primary flight information, in place of traditional pitot- static and gyroscopic systems and also provides an HSI for navigation. Figure 1-2 GDU 620 PFD and MFD Figure 1-3 GDU 620 PFD and MFD with PFD on Right
1-4Garmin G500 Pilot’s Guide190-01102-02 Rev. D Foreword Sec 1 System Sec 2 PFD Sec 3 MFD Sec 4 Hazard Avoidance Sec 5 Additional Features Sec 6 Annun. & Alerts Sec 7 Symbols Sec 8 Glossary Appendix A Appendix B Index 1.1.3 GDC 74A The GDC 74A Air Data Computer (ADC) compiles information from the pitot/static system and an Outside Air Temperature (OAT) sensor. The GDC 74A provides pressure altitude, airspeed, vertical speed, and OAT information to the G500 system. The GDC 74A communicates with the GDU 620 and GRS 77 using an ARINC 429 digital interface. Figure 1-4 GDC 74A Air Data Computer 1.1.4 GRS 77 The GRS 77 is an Attitude and Heading Reference System (AHRS) unit that provides aircraft attitude information to the G500 display. The unit contains advanced tilt sensors, accelerometers, and rate sensors. In addition, the GRS 77 interfaces with both the GDC 74A Air Data Computer and the GMU 44 magnetometer. The GRS 77 also utilizes GPS data forwarded from the GDU 620. Actual attitude and heading information is sent to the GDU 620 using an ARINC 429 digital interface. Figure 1-5 GRS 77 AHRS The IGRF (International Geomagnetic Reference Field) model is contained in the GRS 77 and is only updated once every five years. The IGRF model is part of the Navigation Database. At system power-up, the IGRF models in the GRS 77 and in the Navigation Database are compared, and if the IGRF model in the GRS 77 is out of date, the user is prompted to update the IGRF model in the GRS 77. The prompt will appear after the G500 splash screen is acknowledged on the MFD.