Eclipse AVN2210p mk II, Owner'S Manual

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How does navigation work? 18.
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How does navigation work?
Global Positioning System (GPS)
In order to navigate you to your destination, your TomTom must know where
you are now. To find your current position, your TomTom uses the Global
Positioning System (GPS). GPS is available for free and without subscription.
The GPS uses satellites to transmit signals to GPS receivers. Your TomTom
uses a GPS receiver built into your car when inserted in your car stereo, and
it has a built-in GPS receiver that it uses when it is not inserted in the car
stereo. Using the GPS signal, your TomTom can work out where you are and
how fast you are going. GPS signals work in all weather, anywhere in the
world.
Note : Your TomTom does not transmit your position, so others cannot use it
to track you while you are driving. You can however send your position to
TomTom Buddies. For more information, visit www.tomtom.com/plus
Maps
Once your TomTom knows where you are and you have told it where you
want to go, it uses the digital map on the memory card to work out the best
route to your destination.