1-4Garmin GTR 225/225A/225B Pilot’s Guide 190-01182-00 Rev. A1.2.9 FUNC (Function) KeyThe FUNC (Function) key accesses function categories forthe following: the Com Radio, ICS Configuration, SystemConfiguration, and Timer. Pressing the FUNC key once displaysthe Function mode. Pressing the FUNC key a second time exitsthe Function mode.1.2.10 MON (Monitor) KeyThe MON (Monitor) key will engage the monitor function wherethe Standby frequency may be monitored while still listening tothe Active frequency.1.3 USB PortThe USB port is used to update the frequency database in the GTR 225.NOTE: Garmin recommends the use of a USB 2.0 compatible USB flashdrive for updating the database.