TomTom ONE XL Manual page 7

You can also download QuickGPSfix directly to your device using a wireless
data connection on your phone. Your mobile operator may charge you for
using a wireless data connection.
Note: Your TomTom ONE XL does not transmit your position. You can
however send your position to TomTom Buddies. For more information, visit
www.tomtom.com/plus
Note: Some vehicles have a heat reflective shield embedded in the
windscreen, which may prevent TomTom ONE XL from locating your current
position. If this is a problem in your vehicle, use the TomTom External
Antenna Kit (available as an accessory).
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