I saw photo on the a.net data base of Grosse Ile, MI (ONZ) airport. The caption states that you can see the old circular runway. It is a paved circle between the regular runways. I guess that is from the days when ONZ was a naval air station. What is a a circular runway? Why would you have such a thing? and How does is work? I have seen something similar at an old air station in Newport, MI too.
The sign at ONZ says that it was a Naval Air Station until 1969. What kinds of planes was the Navy flying there in the 50s and 60s?