Ferry Rights in Loch Aw, Scotland

My ancestors were granted the ferrying rights across Loch Aw, Scotland in 1488. The (much abridged) document reads:

In the name of god amen…¬†in the 7th year of Innocent, the 6th divine providence, Pope, in the presence of me, the notary public, the good and honest man, Moricius McFedran, handed over a certain letter written on a parchment about the ground as it appeared to be…lochaw1…containing word that it to me be clear to all that, given and to the honour and praise of Almighty God of the Blessed Virgin and all the saints for the safety of our soul and of the souls of all our ancestors and to the successors of the Lord of Lochaw, to have set and demitted to our faithful Dominicus McFedran by force of those present to his male heirs begotten or to be begotten the one mark of land of Sonachan near to the port extending to the river which is called Altbane and the river which is called Altynesperry lying in the Lordship of Lochaw, to be held and possessed all and the whole of the mark land along with the duty of ferrying …understanding that¬†Dominicus and his heirs will carry all infirm, lame, poor and pilgrims without price or charge across the Loch.lochaw2The cost per year: 10 shillings of silver, two bolls of grain which are called barley and oats, one pound of cheese and a sheep.