1. A system for enhanced display of obstacles in a combined vision display, the system comprising: a display unit; an enhanced vision system configured to generate first signals representative of enhanced vision images; a data storage device containing obstacle data representative of obstacles; a synthetic vision system configured to selectively retrieve obstacle data from the data storage device and generate second signals representative of synthetic vision images of one or more obstacles; a processor in operable communication with the display unit and coupled to receive the first and second signals and configured, in response thereto, to: selectively overlay the synthetic vision images of the one or more obstacles over the enhanced vision images; and command the display unit to display the synthetic vision images of the one or more obstacles overlaid over the enhanced vision images.