This Boots colour slide shows a ferry either just leaving or just arriving on its trip between the mainland of Scotland and the Isle of Skye.
I wasn't sure of the exact location so I'm indebted to Steve who pointed out in the comments that this is the ferry which departs from the mainland at Kyle of Lochalsh and arrives on Skye at Kyleakin. The picture itself is a bit dirty, and was taken on Boots colour slide film, although the date is unfortunately unknown.