I sing Farewell to Tarwathie in G. Chords I found included a minor chord; so like this:

Fare[G]well to Tar[Em]wathie, a[C]dieu Mormond [G] Hill
And the dear land of [Em] Crimond, I [C] bid you fare[G]well
I'm [G] bound all for [Em] Greenland and [D] ready to [G] sail
In the hopes to find [Em] riches in [D] hunting the [G] whale.

I like the Em, it adds colour to the accompaniment.

Ian Campbell sings (sang) "With our ship unco' full we'll homeward repair". Unco' in that context is a strong form of "very". I like it better than "bumper full" even if that's what Greig & Duncan collected.

As to Mormond Braes, I also know the tune as the one in the clip linked by Tattie Bogle in Oct 11. The same tune is in Norman Buchan's 101 Scottish Songs

My Mother and Grandmother (from Stoneywood, just North of Aberdeen) were always a bit sniffy about Robin Hall's and Jimmie McGregor's Glasgow accents on that song. Nevertheless, their "Scottish Choice" album is still one of my favourites.