MV Caledonian Isles () is one of the largest ships owned by Caledonian Maritime Assets Limited. She is operated by Caledonian MacBrayne (CalMac), which runs ferries to the Hebridean and Clyde Islands of Scotland. Caledonian Isles serves the Isle of Arran on the Ardrossan to Brodick route. As it is one of CalMac's busiest routes, Caledonian Isles has the largest passenger capacity in the fleet, and can carry up to 1000 passengers and 110 cars, with a crossing time of 55 minutes. She is used extensively by day-trippers to the Isle of Arran during the summer. When enters service in 2023, Caledonian Isles is expected to become the second vessel on the Ardrossan-Brodick ferry crossing. Layout Modelled on the popular of five years earlier, Caledonian Isles incorporates a fully enclosed car deck with watertight ramps at either end. When closed, the bow ramp seals the car deck and when open, forms the bridge between the ship and the linkspan. The car deck incorporates a set of mezzanine decks, one down each side of the central casing and each divided into three sections. These can be moved up and down to their deployed or stowed positions. When deployed, these allow additional cars to be loaded. If the mezzanine decks are fully deployed there is insufficient height to accommodate lorries and other high vehicles other than at the bow and stern. The central casing means that she can only carry one lane of commercial vehicles down each side of the car deck. The passenger accommodation is similar to that onboard the Mull ship. Forward of the main entrance square is the cafeteria, with stairways leading up to the observation lounge and the outside deck. Aft of the entrance there are lounges down either side with toilet blocks, the shop and a bar lounge further towards the stern. The next deck up has the forward observation lounge at the bow and crew accommodation. An open deck extends right around the vessel on this level, including forward of the observation lounge and overlooking the bow. The upper deck has the bridge and outside seating from the huge red funnel towards the stern. Also on this level are the four enclosed lifeboats – 2 larger and 2 smaller boats mounted on davits. The 2 larger lifeboats were replaced in 2017 to make way for the new marine evacuation system. Service Caledonian Isles has only ever