Honda 2007 S2000 Online Reference Owner's Manual page 99

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Playing the XM Satellite Radio (Optional on U.S. Models)
Signal may be
blocked by
mountains or
large obstacles to
the south.
SATELLITE
96
Signal is weaker in
these areas.
GROUND
REPEATER
The XM satellites are in orbit over
the equator; therefore, objects south
of the vehicle may cause satellite
reception interruptions. To help
compensate for this, ground-based
repeaters are placed in major
metropolitan areas.
Satellite signals are more likely to be
blocked by tall buildings and
mountains the farther north you
travel from the equator.