This article explores the understanding and use of triangulation. I will discuss different conceptualisations of triangulation, as well as the underlying ontological notions of these conceptualisations. Triangulation of methods is one type of triangulation that is used to improve the quality of qualitative research, along with data triangulation, researcher triangulation and theory triangulation. These can all be seen as techniques for examining one specific point in a landscape from different angles, as when navigating at sea. Another way of understanding triangulation suggests the use of e.g. different methods to create various data, i.e. to shed light on different points in the same landscape. In this article I will discuss how I understand and use triangulation in my current project. That project investigates the phenomenon of eating disorder symptomatology among men and women in residential treatment for substance dependence, and triangulation is used to strengthen the quality of the project in various ways