An incident management system with graphical user interface mechanisms for control of the routing of incoming calls and other information regarding a plurality of ongoing incidents. Thumbnail icons, each corresponding to a different defined geographic area, are displayed and, in response to a user input selecting a thumbnail icon, a map is displayed identifying a defined geographic area corresponding to the selected thumbnail icon with a plurality of call icons and at least one incident icon. The call icons each correspond to a different active incoming call from within the defined geographic area and are each positioned on the map accordingly. At least one of the displayed call icons is assigned to an incident group and an incident icon is displayed for each ongoing incident managed by the system to which at least one displayed call icon has been assigned.