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1-3190-01182-01 Rev. A
Garmin GNC 255A/255B Pilot’s Guide
1.2.3 Tuning LARGE/SMALL Concentric (Cursor)
Knobs
The LARGE right and
SMALL right
knobs are used for tuning
frequencies and data entry.
SMALL, Inner Knob
LARGE, Outer Knob
1.2.4 FLIP/FLOP Key
Press and release the FLIP/FLOP key to switch between the
active (left-most) and standby (right-most) frequency. Switching
between Com frequencies is disabled while you are transmitting.
1.2.5 C/N (Com/Nav) Key
Press the C/N key to select the Com or Nav (VLOC) radio
mode.
1.2.6 OBS Key
Press the OBS key to see the current OBS setting and graphic
CDI. The OBS page will be disabled if the unit is installed with
an external converter.
1.2.7 T/F (To/From) Key
Press the T/F key to toggle between the bearing TO or radial
FROM the active VOR. The T/F page also shows Distance/Speed/
Time information. The T/F key does not operate for Localizer
frequencies.
1.2.8 CLR (Clear) Key
Pressing the CLR key erases information, cancels entries, and
resets timers.
1.2.9 ENT (Enter) Key
Press the ENT key to save selected values, to confirm a prompt,
or to save the Standby frequency.