1-4
Garmin G600 Pilot’s Guide
190-00601-02 Rev. B
For
ewor
d
Sec 1
System
Sec 2
PFD
Sec 3
MFD
Sec 4
Hazar
d
Avoidance
Sec 5
Additional Featur
es
Sec 6
Annun. & Alerts
Sec 7
Symbols
Sec 8
Glossary
Appendix A
Appendix B
Index
1.1.4
GRS 77
The GRS 77 is an Attitude and Heading Reference System (AHRS) unit that
provides aircraft attitude information to the G600 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 using an ARINC 429 digital
interface to the GDU 620.
Figure 1-4 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GRS 77 is out of date, the user is prompted to update the IGRF model in the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 G600 splash screen is acknowledged
on the MFD.
1.1.5
GMU 44
The GMU 44 magnetometer senses the earth’s magnetic field. Data is sent to
the GRS 77 AHRS for processing to determine aircraft magnetic heading. This
unit receives power directly from the GRS 77 and communicates with the GRS
77 using a RS-485 digital interface.
Figure 1-5 GMU 44 Magnetometer
Summary of Contents for G600
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