Comrade Borris
The data bases for the entire world are very large and expensive. we get them for the fixed aircraft systems but they cost a fortune, even though we get them straight from the states
They try and make the handheld units cheaper and smaller by breaking the world up in 3 parts ( N+S America, europe russia Africa, australia and asia)
If you take a SA aviation unit to the USA it will tell you where you are and how fast ect ect, but it will have no airspace boundry information, frequencies, contacts, navigation instrument information , Airport information ect ect
The vista we are talking about will lose all the special features it has, but could probably be used as a pure coordinates unit, but you can buy that type here for much much less than a Vista