Magellan RoadMate N399M User Manual page 12

The Magellan RoadMate receiver has a built-in battery so, in most cases, you
will be able to follow these instructions while reading them on your computer
screen without plugging the Magellan RoadMate receiver to the AC power
using an optional AC power adapter. You should note that while indoors you
may not get strong enough satellite signals to compute your location, so your
location information may not be updated. However, the power of the GPS
chipset installed in the Magellan RoadMate receiver will pick up satellite
signals in some very demanding locations. You may find that the Magellan
RoadMate receiver is computing a position, even indoors. Even with the
improved GPS chipset, the receiver may not be able to always compute a fix
indoors. This is especially important to note if you are in a garage or other
overhanging structure. If you find you are not getting strong enough satellite
signals while in a garage or other structure, move to a location where there is
a clear view of the sky and you should immediately see an improvement in
signal strength.
The Magellan RoadMate receiver includes Voice Alerts (Text-to-Speech) for
driving instructions.
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