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Garmin GNC 255A/255B Pilot’s Guide
190-01182-01 Rev. A
WARNING: For safety reasons, GNC 255 operational procedures must be
learned on the ground.
CAUTION: The Garmin GNC 255 does not contain any user-serviceable
parts. Repairs should only be made by an authorized Garmin service center.
Unauthorized repairs or modifications could void both the warranty and
the pilot’s authority to operate this device under FAA/FCC regulations.
CAUTION: The GNC 255 display uses a lens coated with a special anti-
reflective coating that is very sensitive to skin oils, waxes, and abrasive
cleaners. CLEANERS CONTAINING AMMONIA WILL HARM THE ANTI-
REFLECTIVE COATING. It is very important to clean the lens using a clean,
lint-free cloth and an eyeglass lens cleaner that is specified as safe for
anti-reflective coatings.
NOTE: Garmin recommends that if flying in a region with 8.33 kHz COM
channel spacing, the radio should remain in 8.33 kHz mode. This will prevent
the loss of stored user and recent frequencies.
NOTE: Do not use outdated database information. Databases used in the
system must be updated regularly in order to ensure that the information
remains current. Pilots using an outdated database do so entirely at their
own risk.
NOTE: All visual depictions contained within this document, including
screen images of the GNC 255 bezel and displays, are subject to change
and may not reflect the most current GNC 255 software. Depictions of
equipment may differ slightly from the actual equipment.
NOTE: This device complies with part 15 of the FCC Rules. Operation is
subject to the following two conditions: (1) this device may not cause
harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation.
NOTE: This product, its packaging, and its components contain chemicals
known to the State of California to cause cancer, birth defects, or
reproductive harm. This notice is being provided in accordance with
California’s Proposition 65. If you have any questions or would like
additional information, please refer to our web site at www.garmin.com/
prop65.