Dynamic interactive visualisations (DIVs) are intended to help coordination and collaboration, through augmenting existing forms of synchronous communication (i.e. phones, face to face, walkie-talkie). A central feature of a DIV is active user involvement: users are required to create, annotate and change the information visualisation to represent the changes in the activity space they are concerned with. A main benefit of doing so is to enable users to externalise and offload some of the cognitive effort involved in problem-solving, by laying out information in ways that can help them derive a solution and know what to do next. In this paper we describe how we went about designing a DIV to support nomadic team working. We begin by describing our experimentation in designing a DIV. We then show how our computer-based DIV substantially improved performance for a complex collaborative task, which involved much communication and cognition.