A red button display?
We all know that Sully and crew performed expertly and immaculately-but what would have happened if cloudbase had been a thousand feet? Is there a case , especially for crews that do not have a deep knowledge of important critical local conditions (for example, nearby runways,nature of populations and buildings, including height) . Nav input could be basic GPS including altitude. Suitable provider could be combination of Google maps and Jepperson
Keith