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• GEA 71 (1) – Receives and processes signals from the engine and airframe sensors. This unit communicates
with both GIA 63Ws using an RS-485 digital interface.
• GRS 77 (1) – Provides aircraft attitude and heading information via ARINC 429 to both the GDU 1040 and the
GIA 63W. The GRS 77 contains advanced sensors (including accelerometers and rate sensors) and interfaces
with the on-side GMU 44 to obtain magnetic field information, with the GDC 74A to obtain air data, and with
both GIAs to obtain GPS information. AHRS modes of operation are discussed later in this document.
• GMU 44 (1) – Measures local magnetic field. Data is sent to the GRS 77 for processing to determine aircraft
magnetic heading. This unit receives power directly from the GRS 77 and communicates with the GRS 77
using an RS-485 digital interface.
• GMA 1347 – The GMA 1347 Audio Panel integrates NAV/COM digital audio, intercom system, and marker
beacon controls. The GMA 1347 also controls manual display reversionary mode (red DISPLAY BACKUP
button) and is installed between the MFD and the PFD. The GMA 1347 communicates with both GIA 63Ws
using an RS-232 digital interface.
190-00692-00 Rev. B
Garmin G1000 Pilot's Guide for Piper PA32
SYSTEM OVERVIEW
1-3
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