BMW 2010 Z4 Owner's Manual page 152

Automatic update
About twice a year, Sirius performs an update of
the channel names and positions. The update
takes place automatically and may take several
minutes.
Notes
> Reception may not be available in some sit-
uations, such as under certain environmen-
tal or topographic conditions. The satellite
radio cannot influence this.
> The signal may not be available in tunnels or
underground garages; next to tall buildings;
or near trees, mountains or other powerful
sources of radio interference.
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