Retinav LLC offers the Skywriter, a portable head up display (HUD) for general aviation. Skywriter brings the HUD's proven margin of flight safety and utility to general aviation at only a few percent of the price of the more limited legacy systems currently installed in a very few Part 23 and 25 aircraft. The Skywriter system is practical in Experimental and Light Sport Aircraft, as well. Skywriter is fully portable; it is self-contained; and it installs in minutes atop the glare shield. It is independent, providing the redundant GPS, AHRS, CPU, and flight data used by its own software. Its unique, patented EVS (Enhanced Vision System) is an aviation first that automatically reacts to incoming light, maintaining high display from bright daylight to night, keeping critical information visible, non-intrusively, in the pilot's line of sight. For more information visit www.skywriternav.com.