one thing that could be wrong, is that it doesn't work in Firefox. Keep getting that "Get Silverlight" thing (an on another computer it crashes), when it does work in IE. Besides that, your app rocks.
Never thought of countries are arrays:
public static readonly Double[] Ireland = { 173.997, 53.937495, 173.8845, 52.237485, 172.1592, 51.887475, 171.4842, 51.224985, 169.9218, 52.037505, 170.5968, 52.887465, 170.19675, 53.18748, 170.2593, 54.049995, 171.68445, 54.474975, 172.00935, 55.318725, 174.2094, 55.318725, 174.6216, 54.187515, 173.997, 53.937495 };
:D