Described is a context map that assists users in determining a current location within a source region of a display monitor that is being magnified. The context map comprises a visible image representing a location of the unmagnified region that is being magnified. The visible image may be an indicator...http://www.google.co.uk/patents/US20070013722?utm_source=gb-gplus-sharePatent US20070013722 - Context map in computer display magnification
