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1-1190-01182-01 Rev. A
Garmin GNC 255A/255B Pilot’s Guide
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, a Com
radio configuration of 8.33 kHz steps is also available. 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. The GNC 255 is available in 10 and 16
watt com transmitter versions. The GNC 255A is available with a 10 watt com
transmitter. The GNC 255B is available with a 16 watt com transmitter.
Power On/Off,
Com Volume,
Squelch On/Off
Photo Sensor
USB Port
Locking
Screw
Nav (VLOC)
Volume, Nav ID
On/Off
LARGE and
SMALL Knobs
(Frequency
Adjust)
Frequency
Monitor Key
Frequency Transfer
(FLIP/FLOP) Key
Com or Nav
Frequency Selection
OBS Selection
To/From Selection
Enter Key
Clear Data Key
Function Selection
Figure 1-1 GNC 255 Front Panel Description