Wi-Fi Bluetooth Com Port Issues

Tricky little problem... I bought Autoroute 2005 (Brit Version of S&T
2005) because it was supposed to be happy with BT GPS, like TomTom and
Navman units - and use with my Toshiba M200 Tablet. I've tried to get
it to recognise my TomTom GPS but its complaining it can only see ports
up to Comm 20....and the Tom Tom is at Comm 41, with lots of other BT
and (I presume) WI-Fi bits using the lower Comm ports.

I've searched in MS, Toshiba, Google and user groups, and unless I'm
being dim, can't find any links to teach me how to force or change the
GPS to a lower Comms Port and I don't want to break the Wi-Fi side....

Any ideas or links would be gratefully received !

Regards,

AMK