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Garmin GNC 255A/255B Pilot’s Guide
190-01182-01 Rev. A
1.2.10 FUNC (Function) Key
The FUNC (Function) key accesses function categories for the
following: the Com Radio, Nav Radio, ICS Configuration, System
Configuration, and Timer. Pressing the FUNC key once displays
the Function mode. Pressing the FUNC key a second time exits
the Function mode.
1.2.11 MON (Monitor) Key
The MON (Monitor) key will engage the monitor function where
the Standby frequency may be monitored while still listening to
the Active frequency.
1.3 USB Port
The USB port is used to update the frequency database in the GNC 255.
NOTE: Garmin recommends the use of a USB 2.0 compatible USB flash
drive for updating the database.