WayteQ X995, Руководство пользователя

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10
The signals of the GPS satellites cannot
penetrate solid objects (except glass). The
positioning does not work inside buildings and
tunnels. Receiving of GPS signals may interfered
by different environmental factors (bad weather,
tall buildings, devices using wireless technology).
2.4 Aircrafts and hospitals
On most airplanes, in hospitals and other
institutions, it is prohibited to use devices with
antenna.