Garmin Astro 220 Owner's Manual page 70

Hearing Aids–Some digital wireless radios may interfere with some
hearing aids. In the event of such interference, you may want to
consult your hearing aid manufacturer to discuss alternatives.
Other Medical Devices–If you use any other personal medical device,
consult the manufacturer of your device to determine if it is adequately
shielded from external RF energy. Your physician may be able to assist
you in obtaining this information.
Turn your radio OFF in health care facilities when any regulations
posted in these areas instruct you to do so. Hospitals or health care
facilities may be using equipment that could be sensitive to external
RF energy.
Vehicles–RF signals may affect improperly installed or inadequately
shielded electronic systems in motor vehicles. Check with the
manufacturer or its representative regarding your vehicle. You should
also consult the manufacturer of any equipment that has been added to
your vehicle.
Posted Facilities–Turn your radio OFF in any facility where posted
notices so require.
Commercial Aircraft–Many commercial airlines prohibit the use of
FRS/GMRS radios on board. Switch OFF your radio before boarding
an aircraft or check the airline rules.
Blasting Areas–To avoid interfering with blasting operations, turn
your radio OFF when in a "blasting area" or in areas posted: "Turn off
two-way radio." Obey all signs and instructions.
Astro Dog Tracking System Owner's Manual
Potentially Explosive Atmospheres–Turn your radio OFF and do
not remove your battery when you are in any area with a potentially
explosive atmosphere. Obey all signs and instructions. Sparks from
your battery in such areas could cause an explosion or fire resulting in
bodily injury or even death.
Areas with a potentially explosive atmosphere are often, but not
always clearly marked. They include fueling areas such as gasoline
stations, below deck on boats, fuel or chemical transfer or storage
facilities; vehicles using liquefied petroleum gas (such as propane or
butane); areas where the air contains chemicals or particles, such as
grain, dust, or metal powders; and any other area where you would
normally be advised to turn off your vehicle engine.
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