Garmin G300 Pilot's Manual page 7

warnings, Cautions & notes
WARNING: The illustrations in this guide are only examples. Never
use the G300 to attempt to penetrate a thunderstorm. Both the
FAA Advisory Circular, Subject: Thunderstorms, and the Aeronautical
Information Manual (AIM) recommend avoiding "by at least 20 miles any
thunderstorm identified as severe or giving an intense radar echo."
WARNING: To reduce the risk of unsafe operation, carefully review and
understand all aspects of the G300 Pilot's Guide documentation and the
Pilot's Operating Handbook of the aircraft. Thoroughly practice basic
operation prior to actual use. During flight operations, carefully compare
indications from the G300 to all available navigation sources, including
the information from other NAVAIDs, visual sightings, charts, etc. For
safety purposes, always resolve any discrepancies before continuing
navigation.
WARNING: Because of variation in the earth's magnetic field, operating
the G300 within the following areas could result in loss of reliable attitude
and heading indications. North of 72° North latitude at all longitudes;
South of 70° South latitude at all longitudes; North of 65° North latitude
between longitude 75° W and 120° W. (Northern Canada); North of 70°
North latitude between longitude 70° W and 128° W. (Northern Canada);
North of 70° North latitude between longitude 85° E and 114° E. (Northern
Russia); South of 55° South latitude between longitude 120° E and 165° E.
(Region south of Australia and New Zealand)
WARNING: The Garmin G300 has a very high degree of functional
integrity. However, the pilot must recognize that providing monitoring
and/or self-test capability for all conceivable system failures is not
practical. Although unlikely, it may be possible for erroneous operation
to occur without a fault indication shown by the G300. It is thus the
responsibility of the pilot to detect such an occurrence by means of
cross-checking with all redundant or correlated information available
in the cockpit.
WARNING: For safety reasons, G300 operational procedures must be
learned on the ground.
190-00921-00 Rev. D Garmin G300 Pilot's Guide