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1 Getting Started
1.1 Product Description
Combining a powerful VHF communications transceiver with 200 channel VOR,
Localizer and Glideslope receivers, the GNC 255 provides a full-functioned
navigation and communications solution in a small footprint at a very affordable
price. Besides traditional NAV/COM features, the GNC 255 also incorporates
workload-reducing functions such as automatic decoding of the Morse code station
identifier for VOR/LOC, most-used frequency storage in memory, built-in course
deviation indicator, and more.
The GNC 255 has the ability to monitor the standby COM frequencies. The GNC
255's COM radio operates in the aviation voice band, from 118.000 to 136.975
MHz, in 25 kHz steps (default). For European operations, configuration for 8.33 kHz
steps is provided with the GNC 255A (10 watt) and GNC 255B (16 watt). The GNC
255 VHF NAV receiver operates from 108 MHz to 117.95 MHz decoding both the
VHF Omni Range and Localizer navigation signals. The built-in Glideslope receiver will
automatically tune the corresponding glideslope paired frequencies (328 MHz to 335
MHz) when the localizer is tuned.
Power On/Off,
COM Volume,
Squelch
On/Off
NAV (VLOC)
Volume, NAV
ID On/Off
Frequency
Monitor Key
COM or NAV
Frequency Selection
OBS Selection
To/From Selection
190-01182-01 Rev. E
Photo Sensor
GNC 255 Front Panel Description
Garmin GNC 255A/255B Pilot's Guide
Locking
Frequency Transfer
Screw
(FLIP/FLOP) Key
Clear Data Key
Function Selection
Getting Started
USB Port
Outer and
Inner Knobs
(Frequency
Adjust)
Enter Key
1-1
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