Well, it all depends on what TT One model you've got. If you connect your TT to your pc and open the "ttgo.bif" file, you should see which model you have.
If it's got a slot for a SD card, your options are good. Then I would suggest an update of your navcore and of course the map of USA.
I would go for this Navcoreand this mapCode:http://linksave.in/8012896774c0a876f337b5I'm also a bit of newbie, but I'm beginning to get the hang of it c",)Code:http://gpsunderground.com/forum/showthread.php?1586-North-America-850.2782