as you've moved more than 500 miles since you last used it, the GPS almanac data will be incorrect - this is the data that tells the unit which satellites will be where at any given time. Turn it on and leave it with a clear view of the sky for about 45 minutes or more, this will then allow it to find new satellites.
And no, I dont work for TomTom, I work for a better GPS company - Garmin.
I've just got back from the US over the weekend and used a TomTom 910 while there and never once did I have any problems getting a signal - it was 4 or 5 bars all the time. However this model has the maps built in but I would've thought that wouldn't affect the GPS reception.
if fergusor's tomtom go is an older model it will have the old chip in it which takes longer to acquire a signal. sham's new 910 has an improved chip & faster acquisition
why not try phone them ?
i just run the network - well, probably not from monday onwards as i might be telling them where to stick their job, but still...
Was in the USA in July, worked perfectly; just leave it to get a signal takes a bit longer than normal as you moved a few thousand miles I think it took around 30mins or so before it got a signal. But once you have a signal every time you use it after that it will pick up a signal in a few minutes.. just as if you was in the UK
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, It didn't seem to work for Sprydle when he was in San Francisco! That's why he was so late showing up at Fort Point! He was lost! 
