The ornamental design for a displaypanel of an electronic navigation device with a computer generated icon, as shown and described.
FIG. 1 shows a first embodiment of the design, and depicts a front view of a display panel of an electronic navigation device with a computer generated icon; the icon being on the right side of the display panel of the navigation device.
FIG. 2 shows a second embodiment of the design, and depicts a front view of a display panel of an electronic navigation device with a computer generated icon; the icon being on the left side of the display panel of the navigation device; and,
FIG. 3 shows a perspective view of the electronic navigation device of the first embodiment.
The broken lines illustrate portions of the electronic navigation device and form no part of the claimed design.