Very nice. But a few issues.
1. The incorrect messages disappears too quickly. And it appears slightly off the screen (I am on a MBP 15"). It should persist.
2. There is no zoom for Europe. I tried using Mediterranean. So when asked to show Estonia, I can't even get to the NW European states without scrolling. Which means that the incorrect message will never be seen.
Similarly, asked for Guernsey had to zoom in but it selected Jersey. No amount of zooming will let me select from the two. It becomes grainy.