Mio H610 - Manual (Page 7)

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Warnings and Notices
For your safety, do not operate the controls of the product while driving.
Use this product with caution. The product is a navigation aid. It does not
provide exact measurements of direction, distance, location or topography.
The calculated route is for reference only. Always follow the posted traffic
signs, speed limits and road restrictions.
Do not leave your device in a car under direct sunlight, without air-condition,
or without adequate ventilation. This can cause the device to overheat and
malfunction.
When the device is overheated, be sure to remove it right away from the
overheated area and place it to a place with cool air. Once the device gets back
to its normal temperature, it can start functioning again.
The Global Positioning System (GPS) is operated by the United States
government, which is solely responsible for its performance. Any change to
the GPS system can affect the accuracy of all GPS equipment world-wide.
GPS satellite signals cannot typically pass through solid materials (except
glass). GPS location information is not typically available inside buildings,
tunnels, or underground parking lots.
A minimum of 4 GPS satellite signals is needed to calculate your GPS
position. Signal reception can be affected by weather events or overhead
obstacles (e.g. dense foliage and tall buildings).
Other wireless devices in the vehicle may interfere with the reception of
satellite signals and cause the reception to be unstable.