My tomtom only gives Guam locations

That is really strange!
I can only suggest that you verify what MAPs are physically on your TomTom device by connecting it to a PC/LAPTOP and use Windows Explorer to look at your GPS drive folders: should see a folder for each 'country' (like GUAM).
The normal way to check which maps are registred and loaded on your device is to use TomTom Home -> Update maps function: it will show you the status or whereabout of any Maps that you have loaded or backup and which one can be purchased.
Hope it helps: let me know how you go.
ps.i f you wisely backup your device on a regular basis (via TomTom Home or direct copy to your PC/LAPTOP), you could always RESTORE FROM BACKUP and start again.

http://tomtomproblems.blogspot.com/2009/02/tomtom-guam-problem.html

two things may have occurred one the north american map has been deleted or guam has been set as the active map if you go into the settings you can change active map back to North america

you may have run out of memory for the full map, your device can use a 2Gb max SDcard which should be enough for all your maps. It will have put placeholder there and tryed to drop the full map but you can only see the bit it could store to the memory.

connect your unit to your pc when prompted by tom tom press yes. go to manage my one on your home page. on the manage your navigation go to item on device click on maps and check guam box and remove from device. only map left will be usa.

Try this:
http://www.tomtom.com/support/index.php?Language=1&query=no+maps+found&FID=9838

if you are using tomtom one you can change your home location from the advanced planning feature..let me know if you managed to change it....:)>-

Click preferences, manage maps, then switch maps. Switch is to USA/Canada and you'll be all set!

This TomTom comes loaded with 2 maps....Guam and the US with Canada. I too got stuck in Guam and it is not obvious how to get out of it. But here it is.
Go to Main Menu, then Change Preferences
Hit forward arrow twice
Go to Manage Maps
Hit forward arrow once and choose Switch Map
It should show you Guam and the US and Canada
Tap US and Canada and it should take you out of Guam!!
Mine did and I am now going to delete the Guam map.

Do a hard reset and change to factory seetings in change preferences. This will ask you which map you want. You may also access this through the manage maps feature