Tuning Large/Small Concentric (Cursor) Knobs; Flip/Flop Key; C/N (Com/Nav) Key; Obs Key - Garmin GNC 255 Pilot's Manual

1.2.3 Tuning LARGE/SMALL Concentric (Cursor)
Knobs
LARGE, Outer Knob
1.2.4

FLIP/FLOP Key

1.2.5

C/N (Com/Nav) Key

1.2.6

OBS Key

1.2.7

T/F (To/From) Key

1.2.8

CLR (Clear) Key

1.2.9

ENT (Enter) Key

190-01182-01 Rev. A
The LARGE right and SMALL right knobs are used for tuning
frequencies and data entry.
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.
Press the C/N key to select the Com or Nav (VLOC) radio
mode.
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.
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.
Pressing the CLR key erases information, cancels entries, and
resets timers.
Press the ENT key to save selected values, to confirm a prompt,
or to save the Standby frequency.
Garmin GNC 255A/255B Pilot's Guide
SMALL, Inner Knob
1-3