Probably I not explained correctly...
If you will write "USA" - app will not find it because it automatically convert it to "Usa".
If you will write "Usa" - app will not find it because in the list it written "USA".
I will fix it when I have time..

Which maps installed you can check in: Maps -> setting -> Manage maps -> here you can see installed maps -> right lower corner -> here you can add/delete/update maps...