This mod lets you travel from Sadrith Mora to Tel Aruhn directly by boat, instead of having to go to up to Tel Mora and back down again. Just seems to make more sense to me. The new Sadrith Mora-Tel Aruhn route replaces the Sadrith Mora-Ebonheart route. It also changes the mentions of boat travel in the specific place and destination topics, and the scrolls Guide to Sadrith Mora and Guide to Vivec, to reflect this.