Check out the Geographic Midpoint Calculator.
This is a very accessible website, well designed to work with Jaws and fun to play around with, especially if you have a sighted person to help you view the map or you are into geocaching. Unlike many websites, all of the calculator buttons and controls are clearly spoken by Jaws and most of them have a shortcut key. If you use Jaws you can press the h key to skip between the different sections of the web page. Home