Audiovox NPC5000 User Manual And Mounting Instructions page 14

General Information
You can recognize that the reception is sufficient by the green symbol that
appears in the systemís display. If GPS reception is not sufficient, the satellite symbol
remains red.
When starting up, the Audiovox Navigation System may tell you: 'You are now
leaving the digitized area'. The displayed map will then show the vehicle in a
position off the road.
If there are other roads in this area, the Navigation System may send inappropriate
messages. This means that the system assumes the vehicle is on one of the other
roads.
When the vehicle has been parked for a long period of time, the Navigation func-
tion may be temporarily inhibited. The Navigation System will operate reliably again
once GPS reception is available for a few minutes.
Limited GPS reception
System performance may adversely affected if GPS reception is interrupted or
interference occurs over a distance of several miles. GPS reception may be
interrupted or interference occurs:
In multi-level parking garages,
in tunnels and under bridges
In forests or tree-lined avenues
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In between tall buildings
During heavy rain showers and
thunderstorms