Abstract: A navigational system includes a display device and logic that simultaneously presents a textual display of an original flight plan and a modified flight plan on the display device. The textual display includes a textlist of waypoints that are on the original flight plan and the modified flight plan and performance data for common waypoints that are on both the original flight plan and the modified flight plan, as well as for new waypoints that are added to the modified flight plan. The performance data for each common waypoint includes performance data for the waypoint on the original flight plan and for the waypoint on the modified flight plan. The system may further include an interface device that allows an operator to change the modified flight plan. The logic updates the textlist of waypoints on the textual display when the modified flight plan is changed and updates the performance data on the textual display for common waypoints when the modified flight plan is changed.

Abstract: A method of simultaneously presenting a textual display of an original flight plan and a modified flight plan includes displaying a textlist of waypoints, copying waypoints from the original flight plan into the modified flight plan, comparing each waypoint on the modified flight plan with waypoints on the original flight plan, determining, in a first determining step, for each modified flight plan waypoint, whether the modified flight plan waypoint originated from a waypoint in the original flight plan, and adding, in a first adding step, the modified flight plan waypoint to the textlist, when it is determined in the determining step that the modified flight plan waypoint did not originate from a waypoint in the original flight plan.