Leica M Instruction Manual page 202

Notes on the function:
• The GPS aerial is located at the top of the multifunction M hand
grip.
• GPS positioning requires as clear a path as possible between this
aerial and the sky. We therefore recommend holding the camera
with the GPS aerial pointing vertically upwards.
• Make sure that the GPS aerial is not covered with your hand or any
other item, particularly metal objects.
• It may not be possible to receive good signals from GPS satellites
at the following locations or in the following situations. In such
cases, either no positioning or only incorrect positioning is
possible.
– In closed rooms
– Underground
– Under trees
– In a moving vehicle
– Close to high buildings or in steep valleys
– Close to high voltage cables
– In tunnels
– Close to 1.5 GHz cell phones
– With accessories attached to the flash shoe, e.g. a flash unit
Information for safe use
The electromagnetic field generated by the GPS system can influence
instruments and measuring equipment. Therefore, make sure the GPS
function is deactivated on board an aircraft before takeoff or landing,
in hospitals or in other locations where there are restrictions on
wireless transmissions.
Important (legal restrictions on use):
• In certain countries or regions, the use of GPS and associated
technologies may be restricted. Therefore, before travelling in other
countries you should consult the relevant country's embassy or
your travel agent.
• The use of GPS inside the People's Republic of China and Cuba
and close to their borders (exceptions: Hong Kong and Macao) is
prohibited by national laws.
• Violations will be prosecuted by the authorities. The GPS function
is therefore deactivated automatically in these areas.
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