Did you check the Titan GPS thread sticky in the main Titan forum? It has all the GPS settings there.

For mine, all I had to do was change Location - On. External GPS should be on Com4, and Both Google Maps and Live Search are set to use the windows settings (There default when installed)

If that is all good, go outside and let it have some time to get it's inital lock.

QuickGPS does help a bit if you need it to find a sat faster. It is talked about in the GPS thread I mentioned.