The Saturn is a multi purpose roro ferry that is currently owned and operated by the Scottish ferry company Caledonian MacBrayne. She was built in 1977 by Ailsa Shipbuilding Co. in Troon for the company where she was placed on the Rothesay-Wemyss Bay route. She is designed after her older sister ships, the Jupiter and the Juno. Unlike her sister ships, she had a raised bridge, alowing more room for passengers. She presently operates on the route that links Ardrossan with Brodick. Her facilities include two lounges, toilets, a cafe, an outer viewing deck and an open car deck. She is the last of her sister ships still in service with Caledonian MacBrayne, the Juno and the Jupiter were scrapped in 2011. She has a capacity of 530 passengers and can carry 40 cars. Her current port of registry is Glasgow, United Kingdom.