Connect to GPS using wp7

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C#

Mobile

Windows-Phone-7

I am developing a windows phone 7 application, using bing maps and i would like to connect to a gps, not the phone one. any ideas? this is the code. currently i am not connecting to any gps.

<my:Map
                CredentialsProvider="mycode"
                Mode="Aerial"
                Height="487"
                HorizontalAlignment="Left"
                Margin="9,9,0,0"
                Name="map"
                VerticalAlignment="Top"
                Width="438"               
            </my:Map>

any help would be appreciated