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The NAV Volume/ID knob located in the bottom left corner of the bezel controls
audio volume for the NAV radio. Press the NAV Volume/ID knob and the Morse code
tones will be heard. When Morse code tone is active, "ID" will appear to the left of
the NAV active frequency.
The outer right and inner right knobs are used for tuning frequencies and data entry.
To switch between the active (left-most) and standby (right-most)
frequency press and release the FLIP/FLOP key. Switching between
COM frequencies is disabled when transmitting.
To select the COM or NAV (VLOC) radio mode press the C/N key.
To see the current OBS setting and graphic CDI press the OBS key. The
OBS page will be disabled if the unit is installed with an external
converter.
To toggle between the bearing TO or radial FROM the active VOR press
the T/F key. The T/F page also shows Distance/Speed/Time
information. The T/F key does not operate for Localizer frequencies.
To erase information, cancel entries, and reset timers press the CLR
key.
To save selected values, to confirm a prompt, or to save the standby
frequency press the ENT key.
The FUNC (Function) key accesses function categories for the COM
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.
The MON (Monitor) key engages the monitor function. The standby
frequency can be monitored while still listening to the active
frequency.
190-01182-01 Rev. E
NAV Volume/ID Knob
Outer Knob
Garmin GNC 255A/255B Pilot's Guide
Getting Started
Inner Knob
1-3
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