Ensure the latest software is installed. Service Bulletin 20111 details software version 2.25 for supporting the GMX 200.
The manual is 48 pages, heavily illustrated, and organized exactly the way you’d expect for a mid‑size commercial heat‑exchanger installation.
The GWX 75 is compatible with Garmin's GTN series, TXi series, and G500/G600 flight displays.