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• Some wireless communications products
(mobile phone, data detectors and some
others) block satellite signals and also cause
instability of signal reception.
• Some map displays based on location
information (latitude/longitude information)
may be not accurate due to some countries' or
regions' regulations.
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Where radio waves are diffi cult to receive
Note that radio waves may not be received
or it may be diffi cult to receive radio waves
in the following conditions, since GPS uses
radio waves from a satellite.
• Inside or immediately under a building
• Inside a basement or tunnel, and below the
ground or water
• Inside a bag or box
• Building area or residential area
• Inside or under a thick covering of trees
• Near a high-voltage cable
• In a car, inside a train compartment
• Bad weather such as heavy rain or snow
• When there are obstructions (people or
objects) near the terminal
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