Feb 8, 2009 #1 Z zstetz New member Feb 8, 2009 1 0 1 I always see this circular device on one of the windows on the bridge of a large ship. It is about two feet in diameter. Its always there, on old ships and new. WHAT IS IT?
I always see this circular device on one of the windows on the bridge of a large ship. It is about two feet in diameter. Its always there, on old ships and new. WHAT IS IT?