1-5190-01102-02 Rev. E Garmin G500 Pilot’s GuideForewordSec 1SystemSec 2PFDSec 3MFDSec 4HazardAvoidanceSec 5AdditionalFeaturesSec 6Annun.& AlertsSec 7SymbolsSec 8Glossary Appendix AAppendix BIndex1.1.5 GMU 44The GMU 44 magnetometer senses the earth’s magnetic field. Data is sent tothe GRS 77 AHRS for processing to determine aircraft magnetic heading. Thisunit receives power directly from the GRS 77 and communicates with the GRS77 using a RS-485 digital interface.Figure 1-6 GMU 44 Magnetometer1.1.6 GTX 330/330D (Optional)Figure 1-7 GTX 330/330D Mode S TransponderThe GTX 330/330D is a solid-state transponder that provides Modes A, C,and S functions. The transponder provides traffic information to the displaythrough an ARINC 429 digital interface.NOTE: GTX 33/33D can also be used to display traffic information on theGDU 620.1.1.7 GTP 59The GTP 59 temperature probe provides Outside Air Temperature (OAT)data to the GDC 74A.Figure 1-8 GTP 59 Temperature Probe1.1.8 GSR 56The GSR 56 is an Iridium® satellite transceiver that supports voice telephonecalls, aircraft position reporting, and world wide weather products.
