Leaving the Ott Car Park at J280278 cross the road, climb the stile and start on the path wending its way up the slopes of Ott Mountain. As you follow the path it splits with one rocky trail dropping towards the Shimna River and you need to be careful to stick to the higher path or face a clamber up the heathery side of the mountain. The path does eventually disappear but heading for the saddle between Carn and Slieve Loughshannagh will soon pick up a new path and as you close you should see the Mourne Wall.
After crossing the wall a clear path drops down to the now visible Lough Shannagh and Doan should be visible to the left.