you switch on the GPS receiver, activate the bluetooth on your phone and when it discovers the GPS you pair them together and your phone reads the satellite position from the GPS receiver and uses it to find your location.
Your phone must have the necessary software to installed to use the positioning information.
Nokia have free downloadable software that can be used to show your position and let you search for destinations and choose routes http://europe.nokia.com/explore-services/maps
If you want turn by turn voice navigation you have to buy a licence but it is very good. I am only selling this receiver because my new Nokia has one built-in.
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