v190-01182-00 Rev. B Garmin GTR 225/225A/225B Pilot’s GuideContentsProduct Registration and Support .....................................................................iv1 Getting Started ....................................................................................1-11.1 Product Description.............................................................................. 1-11.2 Pilot Controls ....................................................................................... 1-21.3 USB Port .............................................................................................. 1-32 COM RADIO Basic Operation ...............................................................2-12.1 Selecting a COM Frequency .................................................................. 2-12.2 Monitoring the Standby COM Channel ................................................. 2-22.3 Saving a COM Channel ........................................................................ 2-22.4 COM Database Look-Up ...................................................................... 2-42.5 Emergency Channel ............................................................................. 2-52.6 Stuck Mic ............................................................................................ 2-52.7 Frequency Database Reverse Look-Up .................................................. 2-52.8 Remote Frequency Selection Control..................................................... 2-63 Functions..............................................................................................3-13.1 Functions............................................................................................. 3-13.2 COM Frequencies................................................................................. 3-23.2.1 Recent COM Frequencies ............................................................ 3-23.2.2 COM User Frequencies ............................................................... 3-23.2.3 COM Database Frequencies ........................................................ 3-43.2.4 COM Nearest Airports (APT) ....................................................... 3-53.2.5 COM Nearest Area Control Center (ACC) Frequencies ................. 3-53.2.6 COM Nearest Flight Service Station (FSS) Frequencies.................. 3-63.2.7 COM Nearest Weather (WX) Frequencies .................................... 3-63.3 ICS Configuration ................................................................................ 3-73.3.1 Adjust Intercom .......................................................................... 3-73.3.2 AUX Audio ................................................................................. 3-83.3.3 Intercom On/Off ......................................................................... 3-83.3.4 Speaker On/Off........................................................................... 3-93.4 System Configuration ......................................................................... 3-103.4.1 COM Spacing ........................................................................... 3-103.4.2 COM Sidetone (Software v2.10 or later).................................... 3-113.4.3 Display Brightness .................................................................... 3-123.4.4 Display Contrast ....................................................................... 3-123.4.5 Database Info........................................................................... 3-13