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My review of the Nokia LD-4W external GPS unit here and here indicated that there are many reasons why you should get an external GPS, despite having a device with internal GPS. Programs like Nokia Map 2.0 apparently don’t allow you to select which GPS unit you want to use if you have an internal and external enabled on one device. It apparently just uses the internal one. If you want to use the external unit, go to: Tool, Settings, General, Positioning and go to Positioning Methods. Make sure to uncheck the Integrated GPS option and enable Bluetooth GPS, but do make sure to leave the other settings enabled.
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Tips & Tricks
What is network based GPS?
Basically it uses information from the cellular network to aid the GPS in fincing a lock and calculating the position.
why would you suggest leaving the other settings checked if using an external gps? i have used an external unit with an older n95 (plus a p1i, treo 750) and it locks on almost instantly. thanks