#54661, "RE: Mauretania bridge top mystery structure " In response to In response to 15
I notice in the case of Lusitania that the compass was originally mounted to the wheelhouse roof, with no platform at all. A platform similar to Mauretania's was later added, and can be seen in the video of her last sailing. See https://www.youtube.com/watch?v=7ZOqw5XEaN0 at around the 4:27 and 5:00 time marks.
Lusitania also had a second platform between funnels 1 and 2 (visible around 4:24 in the video). I don't know if anything similar was present on Mauretania.