Might be this one - Sailing homeward to Mingulay

If it's not, try and remember a line or a phrase from it. If it is, that's a story about it I'd never heard. Perhaps someone else knows more about it.

And of course if it was this song, they'd have been singing it in the Gaelic, and no doubt someone has the words for that too, if you stick around and come back for it. There's always someone can answer just about any question about songs or tunes, or most things.