A graphical user interface for a financial activity network that includes a central managing system connected to a plurality of participant terminals. Rules governing operation of the financial activity are stored for future reference. A participant provides investment information such as a map location for the predicted strike by the natural event and, optionally, one or more secondary parameters relating to the natural event, such as the time interval between the time of investment and the time of all event strike and/or the severity of the event strike according to an established scale. The graphical user interface provides the user with the ability to select options and view data from a screen display, with recalculations of data being displayed on an ongoing basis, reflecting the user's current selections.