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2-1190-01182-01 Rev. A
Garmin GNC 255A/255B Pilot’s Guide
2 BASIC OPERATION
2.1 Power On
Turn the GNC 255 on by either turning the Power/Com Volume/
Squelch knob clockwise to turn the power on or, if installed,
turning on the master switch that powers the radios.
2.2 Com Radio
2.2.1 Selecting a Com Frequency
New frequencies are first selected as a Standby frequency and then toggled to
the Active side with the
FLIP/FLOP
key. While viewing the Standby frequency
display, use the LARGE and SMALL knobs on the right side of the GNC 255 to
select the desired frequency.
1. Press C/N, if necessary, to reach the Com radio function. The
COM annunciator on the top line of the display will show.
2. Turn the LARGE knob to change the values in one MHz
increments. The MHz selection range is between 118 and 136
in one MHz steps.
3. Turn the SMALL knob to change the values in 25 kHz or 8.33
kHz increments. The kHz selection range is between 000 and
975 kHz in 25 kHz steps or 000 and 990 kHz in 8.33 kHz steps.
4. Turn the LARGE and SMALL knobs clockwise to increase and
counterclockwise to decrease the frequency values. Standby
frequency selection is not inhibited during transmit.
5. When connected to a position source, nearby station identifiers
will be shown for the selected frequency. Frequencies with
multiple types will have an asterisk next to the identifier.
Asterisk Indicates Multiple Types
Exist For The Selected Frequency
Identifier and Type Shown For
The Selected Frequency
Figure 2-1 Com Frequency Selection
6. Press and release the FLIP/FLOP key to toggle the Standby
frequency to the Active frequency.