There were several imperial yachts. The Polar Star was the Dowager Empress Marie's to use. I am away from my library [it is in SF, I am in the UK] but one one of the earlier threads dealing with the yachts, under transportation, you can find the sources. Also, lots of pictures. The Livadia, built in Scotland, I think, to the design of some Russian admiral, was a luuxurious interior surounded by those bizarre "wings". I forget whether it was AII or AIII who tried it ONCE and refused to use it again as it "flopped about" way too much. It was also useless as a war vessel for the same reason- guns could not aim & fire with the least reliability.