I'm using route 66 version 8, (just bought it), works flawlessly with the internal GPS,
to use the bluetooth GPS go to
menu -> tools -> settings ->General ->positioning -> positioning methods
select bluetooth GPS to use a bluetooth receiver,
then run route 66 and it will look for a bluetooth device.
or
Deselect Bluetooth GPS and select Integrated GPS and it should work of the internal GPS automatically.
I must admit My Holox BT-321 receiver locks a lot faster than the
N95 internal GPS,
but then again I have used this for a long time maybe the
N95 will improve with usage.
(to use the internal I have only the internal GPS selected in positioning methods).
Personally I am very happy so far with the
N95 internal GPS, just been out in the snow comparing both methods.
(any excuse to play in snow yipee.)