For N95 GPS basically if you install tomtom, it wont support internal GPS. You may need external bluetooth receiver.
Good news are tomtom new version 7 for symbian will support internal GPS.
However, if you install route 66 or garmin software instead, you can use your N95 internal GPS, you donot really need to buy external receiver.
What I am suggesting is still to buy external receiver which will have a good signal.
20 pounds more will reward you stable and good signal is a good deal.
