Hello & Welcome to Just Answer,
Sorry to hear of any issue you may be having.
May I ask for a little bit more detail such as:
1) What area do the maps you have installed cover?
2) How long has the device been in the USA (and powered ON)?
3) What is your CURRENT location (city & state should be good enough)?
4) What is the DESTINATION location that directions are trying to be calculated to?
I see it has been a few days and I just wanted to follow up to see if you have any more questions concerning this issue or if the issue was resolved.
I look forward to any further questions or results that you may have.
Thanks, ***** *****